Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5ca49eb4fb9455…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 04:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd840f1590cbb1fdc631adcd970e4a62 SHA-1: f6de5ba048333183c47c537d0fc3e321ea3053dd SHA-256: fa5ca49eb4fb94558c91a3d7d2ef4fc605a5df6ed6b2054058de283c01668c58
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicative of a link farm. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The heuristics suggest the document is designed to redirect users to external sites, likely for phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16137c4ae3b999---36448354733.pdf In PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/luxililifutamobugalafel.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/xewivonaku.pdfIn PDF document text
    • http://apismorava.eu/docs/pokonegazawagi.pdfIn PDF document text
    • http://selidbe-beograd.info/files/97785185300.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/64862003713.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/33344941992.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/fokodobukagowoxejudo.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/19287933870.pdfIn PDF document text
    • http://farmina.ru/uploads/files/4261586737.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/53275030881.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/poxatonenasakapepow.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/gevanexilonatujuzesu.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-6/20210906044336409220.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e69c553a58---lusiruzumizatibujijik.pdfIn PDF document text
    • https://posh.hr/files/44607510970.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/madejogosoju.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d53e24f234---tesisefega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=play+store+app+appsPDF 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_off0000d8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DA 17928 bytes
SHA-256: c5317f97a11dc0a25ff8282d9f0a800fa0b16f5b88b7364e0737e979bdfb2732
font_01_sfnt_off0001076c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076C 10164 bytes
SHA-256: b182ab963726dd99032b9e9a4738118e3d7a2ea1b7552416a7e4d08ea7c085fc
font_02_sfnt_off00011e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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