Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fbfe218b153ac2e…

MALICIOUS

PDF

76.3 KB Created: 2021-05-23 21:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 37a627a1952ceb4b1c9d5357b9d4483e SHA-1: 62c97308d774ca1202c1960d90798c36b9603f84 SHA-256: 9fbfe218b153ac2e3a31ba19d750cecf0e55dc0929349e96430139e346ee6653
156 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content, possibly disguised as a free book download. The presence of external URIs and link farms points towards an attempt to distribute malware or phish credentials.

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://infrive.ru/uplcv?utm_term=interchange+third+edition+intro+student%2527s+book+pdf+free PDF link annotation
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/33d36e3c10b078d954b44bac7b052c91/30337825337.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0a55a1d96---fijonan.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/tavijipijuboterefigeludo.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bd3c300ff---zurusex.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b3ba422b8---wekad.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/a91d1f63967c6aaf8b925dbcb0d5fccb/13315691784.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/l7bjlhitacg0ltdtvdj4811b25/ritidavejamuwekuj.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918c26d5cda---galupagonika.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/xedaladulev.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/74615301342.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/80257870450.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/xosudabowezowafa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609413171b444---xogafamifit.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/acbd34980ab2ea1c6d669f7812aef2c1/laxibin.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 5560 bytes
SHA-256: ca364d68a9ef75c8f08bbf69d6b17eac7913886b306b56546193ada1ce6dd963
font_01_sfnt_off0000fc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC51 11888 bytes
SHA-256: 141187d71f07b1afcbf9350d19c0f2a88ae253da2b2e6ade3d642951fdfa7e6b

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