Malicious PDF — malware analysis report

Static analysis result for SHA-256 69b2abda5bea44fe…

MALICIOUS

PDF

85.8 KB Created: 2021-08-12 00:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a444052a73893de072da331a99f51d00 SHA-1: 9a576711d781c5e6fa4d6ab211dd588984dc9251 SHA-256: 69b2abda5bea44fe1b7235e4d7280cdcedce6542ec8e9e5dfe86356f7eb4a996
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://medvor.ru/uplcv?utm_term=lord+of+the+flies+symbolism+essay+piggy%27s+glasses PDF link annotation
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/wumariv.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/10925635343.pdfIn PDF document text
    • http://cwesp.biz/upload/file/jajonosotifilasaxazurus.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6b4febf69---90495514157.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/xutemesudiwaji.pdfIn PDF document text
    • http://kme-kme.cz/files/file/82065695276.pdfIn PDF document text
    • http://primaneighbors.com/userimages/40377492729.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/dv5nh0ip0hk79mhgk2mt7vds9c/latobolalasap.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/50886362131.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc776e3f9f---dapuloxasolavixogifiwobub.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/90058831208.pdfIn PDF document text
    • http://atya.eu/files/file/xodexugagomikoped.pdfIn PDF document text
    • https://7gking.tw/upload/files/jisodojel.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/bapolakusara.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076a2f2c8cb3---lapujoxalugovipozejatawan.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/lodetugikosinanazobuwumok.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/nirimepezojakikegudonatad.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/159451318360f9943e4fbfa.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/8426afdd663a0e3a5a596921196d0564/vaxiwuwogakifudakilevar.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/38304212006.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/vokiwawopapasam.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f5e15d6b---61160556237.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d3130e063---65682630964.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/hvrj36864318fk8g18u5v7rit0/93047942950.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/wetamexewoboxal.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cf01e830e---buvilotebevobevubibalun.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_off0000ec83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC83 11088 bytes
SHA-256: af35809d60ff94a6b981739d07546db9c1c51ee7a6a6e5267a559a47c031ecd6
font_01_sfnt_off000105fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FD 16696 bytes
SHA-256: 47e68b436638ddd77d264ef3f664a2e325dd1e121c5c5b1ec1b615eda7e91896
font_02_sfnt_off000130fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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