Malicious PDF — malware analysis report

Static analysis result for SHA-256 85870cce73bfef7c…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 14:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: db101e747c9d6304c88f79f4f9756d4f SHA-1: 4dde2f8ade8e08ab17cfe7306ece2101a62ef212 SHA-256: 85870cce73bfef7c926993279bf1674f1574ae4b5a1ac87b42c881f1ed91b4af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=bosch+induction+hob+instruction+manual PDF link annotation
    • http://sreema.org/FCKeditor/file/23988277250.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56e3f24423---kaboderukuretizebat.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/629f74f2b208f3558d313b768301843c/40123063350.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16102ce3c6f79c---16217545043.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/85517929453.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/vsqaoksoe96iv7ur7gc6hak4tg/56881790164.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ib1vab9eib4ddi1q0gmhpcdhuo/zemizetatozotadipo.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/6e0a9726ad654038de3a6dd8a0220baa/makuwonagakitoloxuk.pdfIn PDF document text
    • http://goref.ru/files/file/ziwiwe.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9e7631928---nulipinakapigukile.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6125c9d6f---tabegevefirizivepopinef.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/36291888953.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/d125be69f40b88ed6f330170dc986b28/tojusaleli.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/60795831827.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/33665847539.pdfIn PDF document text
    • http://praguetransfer.com/files/file/lugetopaza.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/mezejafizonejitamitoza.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/70979079615.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/99119032667.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097821fdbcdb---detutipotimita.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/2f04382296a72ee9bb88a40a3f302851/jojewa.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/nujibavinakujebunozawiriw.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0edb76f9f9---55343056788.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607615d2614e7---36698559777.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_off0000daaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C1 18448 bytes
SHA-256: b5355cad978458c5891470ec6d4d23deac85b5e77e4d898d4706658cf94ab170
font_02_sfnt_off000121d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D0 10796 bytes
SHA-256: 24e48d308a2c1dc0ad511135d77a9fc9236a6b648adf4b74271ca0ca4bc717a0

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