Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2eeb188bdd6ff4…

MALICIOUS

PDF

84.4 KB Created: 2021-07-02 00:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8a256bb7d71914916092a71d18d5bc9e SHA-1: 90d223933806b9479cae60464475eee5fcd4b3c0 SHA-256: 1b2eeb188bdd6ff4f75c2a87cca2eac9825fe02fd3c4e4d76e867e9b34980c87
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1190 Exploit Public-Facing Application T1082 System Information Discovery T1071.001 Web Protocols

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially malicious URLs. Notably, the document contains an instruction to disable security software, a common tactic to facilitate further exploitation. The presence of embedded URLs and the nature of the heuristics suggest it is designed to lead users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://chcial.ru/uplcv?utm_term=game+booster+for+rooted+device PDF link annotation
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/t1qu27hl69rn4tip6olq1ivec8/29767096590.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/jfj2q1unj4mrv2rk960ip0dj45/xipafiwuzajisijib.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/fee90b8b9a5b6d533d56d49d746b822f/biferetozopopujuv.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/e0924cd41b9393a68bead19d1a3ed711/42391893434.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094428a73f0c---23967664694.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210626012143.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/47640489804.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8034372fe---18622987406.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160728ed86922f---55864158789.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a1979a7390b---bugigevatikuforu.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/8bd4fd72eb8c327134b9f1c5dcd7b982/24720412926.pdfIn PDF document text
    • https://austarpharma.com/upload/files/bezatelajidugag.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/37810226797.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/57051081815.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/r8ts16jov7dlej6bdi0brcuc6f/xidusaviwofokufuguxof.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/9774k6hrh0rnl97lc886vqg372/wipenorosexilaxor.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/e3201f9c9435a635d0c79faba0516eb2/refivepirukokaxem.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a834936df51---39797054986.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/38652476519.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/05bcfa2cd03ac63bdaf68f881e8b5cf1/zasivurevuxeluzax.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///202106240547_441875963.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08e4855655---woxaguwuvokaxupere.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/1vkhfqnq8bn8m8es1j1cs5ojlu/6454851852.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/bl6245t2di38mos1vf2pddvh23/27179196866.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b78bd6506---90875236970.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/07f9afbc21798c79acd6eedf22daa1f4/53184012689.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/aj1s2a3gh2a7hhtg8deutgiiu1/43015342666.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/67092028932.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DD 17372 bytes
SHA-256: a8938d7a96a741dffc3c56af58b602890e2a3e19a710448d21d6d555697cfb28
font_01_sfnt_off000111a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BD 10732 bytes
SHA-256: 41f358011010b10dcf6fecb18c482f288fda28f5be847f57dc41e19151f56a04