Malicious PDF — malware analysis report

Static analysis result for SHA-256 60b17fb2e7738fcc…

MALICIOUS

PDF

81.3 KB Created: 2021-09-04 15:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e3d81b69b535d6b7a77c7946e51aa6b7 SHA-1: 294fc0a6ffda5a8c7be22391d35f79b13f5fe71a SHA-256: 60b17fb2e7738fccaa2683b7d41e1df62ca5986a569b357cef891b9cbf77678f
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it's part of a link farm hosted on compromised websites, specifically targeting WordPress installations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs point to suspicious PDF files on these compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075658f6259e---9199326108.pdf In PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/zumoxedijarizum.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/43e7ea309f9b97e5a43163beb11acc10/91366545149.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16103dc4f1864a---94013722257.pdfIn PDF document text
    • https://digiconelectronics.com/media/vosotejejepifemobu.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/2a3df121c0d9bb07e2d19ef30d12ac94/sapamir.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/gelirime.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f461858836---30179368631.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/filuterijifuridefetegu.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/87000273859.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/24635052347.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/99b991ce02d22178a21b3defab6d968d/78174817160.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/94586971559.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/63386135362.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077565662cf7---lerijawikuzekosabotoga.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/58812900649.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/50390146696.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/83612601320.pdfIn PDF document text
    • http://atek-ent.com/upload/file/91674697258.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/89884427519.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/7r1po1d6jq2kcqackcoj7f1nf7/jipafigawadotavurigi.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/sipevokomasarunug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=general+knowledge+about+computer+pdf+filePDF 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_off0000dafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFB 16316 bytes
SHA-256: 4b3567bdbce83e7e94bb7597464af7e59255676c49ba3a79d979d6b4a9b9cf7f
font_01_sfnt_off00010539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D50 11252 bytes
SHA-256: e95055fb7dbeceff4cff1381cea10c004e1311032c6d686bde286b32afaff63c

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