Malicious PDF — malware analysis report

Static analysis result for SHA-256 083cfd96873dd0cc…

MALICIOUS

PDF

83.7 KB Created: 2021-07-08 01:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 21fbb91b00ed56ea98f5620b9f542c21 SHA-1: 27d42cd240ebde45024261263cd4a23e9001121a SHA-256: 083cfd96873dd0cc49ee0d5594298ed582725a3f5c8e7867db27889b390961c6
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links to websites hosted on compromised CMS platforms, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160858c70cd67d---luxuxalukesirewo.pdf In PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/6baa1c8dbc501819f89d934d854cc60e/begenajajotafuzozi.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/xusibebabutamo.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/814890f20935ba71a714b95bacabe52a/jituvusujupojenon.pdfIn PDF document text
    • https://medtek.vn/storage/file/1164800934.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/jmg67g5p60pb0q0fr8q47isi06/tazolibasidumefedasizapob.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6917cb93e---dusixu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/8c0vnio3497v7q0jcnmqg21k9j/16959244038.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/svo62ldfcbsvufejrp4bvnq0o5/gukenit.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/30m9hd6omqqtlj3ria7kr2ub94/24204079695.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/ladadoda.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/dbebaa9c2534c8234d4625af80f09ffa/detojufagomutumav.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a33a91a080b---52545642840.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/zubonojarisekewibe.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/topumotifolaguw.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099cc4336a64---99231525818.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/nifodadoroze.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/netovixubuxoxe.pdfIn PDF document text
    • https://shiokuda2.com/contents//files/3451418653.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/14860015610.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8867a914f5---48829620123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=wcc3+obb+file+downloadPDF 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_off0000e21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA31 17520 bytes
SHA-256: f03284713276de77a004f07c3d60f8fc688ea8726b21d1c25f97e1f16de18545
font_02_sfnt_off0001285b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285B 10492 bytes
SHA-256: af3210e865a6aaafb2d8ce24a662d81a70eaefbe292c5276c7a0fd387e344a47

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