Malicious PDF — malware analysis report

Static analysis result for SHA-256 c466fe82d0f535b5…

MALICIOUS

PDF

86.8 KB Created: 2021-09-22 22:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c6e660cbbf248bb0d911eafd94081d0b SHA-1: 964913f8b8f5e5083cbc97fba12065f2045de512 SHA-256: c466fe82d0f535b53b84c2246b409ed4f16ca00671573d88309bba017c599757
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with numerous URLs pointing to potentially compromised websites. The document body is heavily obfuscated, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613488b019ed7---5219709024.pdf In PDF document text
    • https://fertilizergranulatorprice.com/d/files/43783194799.pdfIn PDF document text
    • http://abworder.com/uploads/files/ramogizogilug.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/kimuxab.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/2sabovi8tbqdas5v6vsrsjb0k7/wovagupilijuzedoxeso.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/fupakaxigo.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/jekawopelofujof.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/viratu.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5062d02cf---vimodudidiwoxo.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/mebadegoxomok.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/sovenaguno.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/ramededajepore.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/20602698378.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/tivobikowapaligifog.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/97464103852.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/72666904073.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/2091927206.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210909201633.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141a8676d344---bibafasiwarerirebikofar.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/56380531919.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/topopuxewibudet.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/kiradazulan.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/56703488206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=7+layers+of+software+engineeringPDF link annotation
    • 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_off0000ec77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC77 18860 bytes
SHA-256: c8c04d6e2442731db3c87a4e892def3e1c844b1119227807e8662da706df5796
font_01_sfnt_off00011d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13568 10544 bytes
SHA-256: d4f73f5f4c10d0c6cd4b7fb0a20dfc4b203bd2b810014a996a9b248e6293120a

Open this report in the interactive analyzer, or submit your own file for analysis.