Malicious PDF — malware analysis report

Static analysis result for SHA-256 8701d5a7b7166c31…

MALICIOUS

PDF

93.1 KB Created: 2021-07-28 00:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d3666097083a5b6dd2162c1237ac8f4b SHA-1: 31ed99798a2a9cd8c26a54901ab7386e928050f7 SHA-256: 8701d5a7b7166c3197bc0e2fccbc476e6e9c3dbafba824255941577f0c2d02db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://tfforming.ru/d/files/23724411955.pdf In PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/cfaf70bbb525ad514efc489f1de215bc/88018049624.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7955c11ad6---walerulerazufi.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/44b16ff6ed2540f9a36d8af1182b4b26/pejenomotegibazibifajaju.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/c1f37aa2b1bb347888e1e6d8c387c171/16299862853.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/3503b6d9ea5ebcdf970d6ad8daec088a/wizinonofinojezemukeliket.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f48b61ae90---nuzum.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/c3f4929abf66a3936a95242e9d8f80e7/40195939865.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/nizufakuvedojipopejidoz.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/mafijebilumexut.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/21871997048.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f142be0b2e---46402088669.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/86561363468.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/402e585a4fbe90997bdcde776ea2cfcf/sebadarozujogafi.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/wofoferepufunurubuzivob.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/ncrolui0r37cs0q1hht65ouvct/negubojetokevigav.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/wijan.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887badd8b11---43504691620.pdfIn PDF document text
    • http://azizolace.cz/images/file/fumobov.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/ebde760d32135bd31b9c949f359df0bf/zavojedulubozul.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae146410db6---pupixima.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/16775671061.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/hq15gq0cge3tft5ikrs8lg4ng4/50473433227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=what+increases+the+boiling+point+of+a+substancePDF 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_off00010513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10513 18248 bytes
SHA-256: 18984cd77e7063deed5c8ea60fb8228ab2cbd323e3be78d38791e34cafb38021
font_01_sfnt_off00013520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13520 10992 bytes
SHA-256: d3d724ebce1151815c141ca3e550395d64a89ea5425b51debbed4b7bc639a85d
font_02_sfnt_off00014e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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