Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcaf57213fee755…

MALICIOUS

PDF

91.4 KB Created: 2021-08-08 19:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: a1666963b69ddc30151cb143d4edcf78 SHA-1: fc9adeec0d227e8d4a8eb26ba803e87a332da9e0 SHA-256: efcaf57213fee7553aa57479b3871f277ed14cd19225709128a418bb2fd40845
216 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and a machine learning classifier, exhibiting characteristics of a phishing lure. It functions as a link farm, directing users to potentially compromised WordPress sites, and includes instructions to disable security software, a high-risk indicator. The presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit users into downloading further malicious content or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://laborke.ru/uplcv?utm_term=coreldraw+graphics+suite+x7+serial+number+free PDF link annotation
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/r5ngg1tvhl375lqlavg4cec0ts/60777404815.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607da5ea48985---850483550.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c166b0f4a---64343915637.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/af137a487d7efb093fb92ccb37fc4ade/75384520164.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/92585125065.pdfIn PDF document text
    • https://isleo.com/i_photos/file/50229762440.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/26410752518.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/990873fbe5352e0f58e0e5eec360d2e7/guwuxewedewadejipumiw.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/4il55t2v5p46ef6cjgti0hrcif/58667651140.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/67288657057.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701cb97d14e---jorabovuxenulu.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f0c66c397---27619932556.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/aa8ee8fc08f5198afbdd6e32ef2c730e/67176285594.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/72909034480.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/lu5aq1fvbdl624fi16572745r3/suwin.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/2692811739.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608298e861bd2---lanux.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cedcba8c2---45904424942.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/85245805465.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de1bcdef78---balatimu.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/aac33mrspobal3uns96cek91i1/48831358201.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/62718048981.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/zuromirusemisogabulamer.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/14c36j6ug8l6q5d9nnvvlflplt/11830020533.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_off0000fd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD80 17612 bytes
SHA-256: 2203009da41186aa6d1dd1b6886bb89864979ce7b1a44b8000e8a4565f932125
font_01_sfnt_off00012b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B71 11576 bytes
SHA-256: ad11d194e8c5e4caf7ec593499bd064666b37c67ad7f4c705dffbdb0fb8521b3
font_02_sfnt_off00014675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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