Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3df08dec12f479…

MALICIOUS

PDF

72.0 KB Created: 2021-09-25 18:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7b19f7cf062b67cb45880505a49a6946 SHA-1: 13d1929ef56ba47fe0b7e03d61c239bdf3b6e9c2 SHA-256: cf3df08dec12f4792b57440b53f13c718dc42840e6f4fb56681b1f68ca8280eb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous links to external sites, many of which appear to be part of a link farm designed to obscure the ultimate destination. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech support scams. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://laborke.ru/uplcv?utm_term=how+to+turn+on+text+to+speech+on+android PDF link annotation
    • http://myslizdrave.com/soubory/fikuzegi.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161372f2b3e814---lemom.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/fulep.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/xakiwogowomovel.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/kinotexijewamisal.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/kuditokewalux.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/72364698773.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/32332994401.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/takiwe.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141234a92255---66407605967.pdfIn PDF document text
    • http://irths.com/upload_files/files/siwevipizoseb.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/9586225537.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/17980330382.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/22003383702.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2f7ec6b8a---47623573822.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/31680241769.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/55543478552.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/joxivaxaxutapupokugute.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/jejozobezeposabufose.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/fedenepogolobise.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/gigulizatop.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_off0000b427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB427 10844 bytes
SHA-256: 854c91554fa95f41e6a6912a0ec1670351c7e969ef08cce57cad7a10b18b59f2
font_01_sfnt_off0000cd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD30 18180 bytes
SHA-256: 9a6787729602d70883cd88b01719e9502a02286eda66bc5e03c4694f478f3fff
font_02_sfnt_off0000faa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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