Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb867e7b42e5030f…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 14:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c483417c9ff94aecc686ab7a14ce7a9f SHA-1: 5cf746cd479b6cbc2a7273dea593fd95ec377d5d SHA-256: fb867e7b42e5030f34fcf5ff0cb2966378740cd1eb993a8a99c6e8c9705b8196
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external links and the nature of the heuristics point towards a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pixomot.ru/uplcv?utm_term=sugar+sugar+game+unblocked PDF link annotation
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/92305452729.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/lumokoxanofa.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f535e78131---69170833423.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/mebolukap.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/71657231010.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/89270643322.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a915a204d4---29798549304.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/66382692536.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/pumulunadexinibagiga.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/34444548667.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/59634473621.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/14399989263.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/vnsulod5rejbt3bgfaipfj1t99/34181719151.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/zafukosotujirefogiliva.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/kolitipaji.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ang4rlv8lq5b3q8msnhbddkiec/31748883348.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/5155244719.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/91690552955.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/vanirewa.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/vujuni.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/90811519958.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/kazazatowumuseperokok.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/lanefapemavovijovura.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_off0000dd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 18284 bytes
SHA-256: 748e1e2d2a6b6d59355a75e45bd2071880be23c70214993cd4a248b9574cf3d5
font_02_sfnt_off000124a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A8 10928 bytes
SHA-256: 8be60310aaf106d8710d57edda6eb2ea49b3dbd1c65f417097cf56f91341fa8f

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