Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af3203b1ee94e71…

MALICIOUS

PDF

86.9 KB Created: 2021-09-16 16:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8173ce3bed64598c85b8b08c6a1f4803 SHA-1: a166c2a5326e41c5a09c25d4455d6e9f40cb5839 SHA-256: 2af3203b1ee94e714c62e08384474ef24f40b56b412fbc8180b9788406eba141
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous unknown PDF files hosted on various domains, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farm characteristics indicates a likely spearphishing attachment used to redirect victims to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c4d0bed27---28033559221.pdf In PDF document text
    • http://study4student.com/cache/fck_files/file/kofilezorivixab.pdfIn PDF document text
    • https://pratham.one/file/betitiri.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/55707332898.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/39203523747.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139a197172d1---5678719778.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/68211694280.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/65824001002.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/76695163357.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/50276082778.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/rolavebiwuru.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/6117705447.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090401113673499.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/4382675940.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/fe089aacf1951b1cc53e6d1ba26c7a6d/97625571102.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/bidonekisek.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/57744123605.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db9165204a---39288908238.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/70264233988.pdfIn PDF document text
    • http://furniture83.com/upload/files/51593862208.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/votexozew.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/57478652012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=watch+cruella+online+putlockerPDF 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_off0000eb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB55 19672 bytes
SHA-256: fe6d8b47c671da52a69188da78d512cce4fb4d14a0a20033eb8bfe1a50a6c94a
font_01_sfnt_off00011e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8C 10488 bytes
SHA-256: 801cb72535b95901188ba87215271c79f1bab9013897052ea5a75fc1c83b767a
font_02_sfnt_off0001365c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1