Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e01c757cd3ac63…

MALICIOUS

PDF

71.2 KB Created: 2021-06-07 08:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: fad516469b33dcb69dff8274020d1edf SHA-1: e75eb4f3907f9ce6266400034defb5d1c96b925f SHA-256: 77e01c757cd3ac6313912e0bd027bd124a94bdeaad3a11647e26ba9f491402b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a link farm pointing to compromised WordPress upload directories and disposable hosting, designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to contain keywords related to game downloads, suggesting a social engineering tactic to entice users to click the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://allytemp.ru/uplcv?utm_term=mcpe+ios+free+download+no+jailbreak PDF link annotation
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46a830f8c1---57113695081.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/loxetati.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/kufibiwireso.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/iv6n3foqdbidgp5pftb75doiss/kijiwonutovodilanizeponem.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ace502111---54150197461.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/kafanovuvabitufo.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/96265979056.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9ec72db1d---26325550102.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/0a9dbff09008f6e26bc8f053731932d7/2655441290.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ea28463b983424bbc02be86d156040ed/5966254407.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea4961080f---vazokose.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/27700197029.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6cbba4514---tezunalorevaruxewudemib.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608708452d27e---71560897534.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/buxugimomadisixi.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/xixojimivubenejikax.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/16609988487.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC17 2960 bytes
SHA-256: 9e8301a812e0963997f2c69c75bfd39e7fcc44359b8a43baf6657440e065e79d
font_01_sfnt_off0000d687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD687 5528 bytes
SHA-256: 8eb7035a59f2e372d104dc613b1f69820d80d693d3d116e226e6c85f64858aac
font_02_sfnt_off0000e983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE983 11180 bytes
SHA-256: 5ade79b42425b0a0d37f86cef14db8275b4c6234b948f42a7ed2cb9f8e6d1093