Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78909da108ccc10…

MALICIOUS

PDF

88.0 KB Created: 2021-09-22 15:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 098c6f3fea69458a1037887ffccac5fa SHA-1: f05d940c0db397ede9d72e6edf1d79985965ad25 SHA-256: a78909da108ccc10b504e65bc91dab43fdc396fadb08427e453d770fc045fd22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with multiple URLs pointing to potentially compromised websites, including one hosted on a WordPress upload directory. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161364d2e170a9---73568711637.pdf In PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/mifidubolelid.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/tevavujevasadaruvejijipav.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/rulenaxaxuwufigapo.pdfIn PDF document text
    • https://theipbuzz.com/images/file/17817118403.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/mikisanozamiziregoguramaz.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/vuwivivifisumakobizitax.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/ponazep.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/tunudinoravedenasosavotef.pdfIn PDF document text
    • https://korankertas.com/contents/files/tuvodup.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xevawosutajom.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/99330825853.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/92115155470.pdfIn PDF document text
    • https://alertsecurity.in/ckfinder/userfiles/files/jigumigimuwefaso.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/8299508966.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2db847b349d25673591da56739b2d90e/95727729907.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/87981916624.pdfIn PDF document text
    • http://seritour.com/rsm/files/7029492376.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614080afa98d0---6988811721.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/fidkg3ss6c5dn6khk7tkna7r5b/49696946071.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/rikowifajugofagivugo.pdfIn PDF document text
    • http://korytnica.net/data/files/33678148347.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/wasejalosogopegixegarov.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/14226331181.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/gividipiwunakoj.pdfIn PDF document text
    • http://dytac.hk/userfiles/78237528774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=csr2+update+3.1PDF 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_off0000f03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001084e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084E 18644 bytes
SHA-256: 9409abd3bc4a7f9f3058820f78af4feb52d61703b57c4247c8737d5ad0f4e241
font_02_sfnt_off0001389a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389A 10564 bytes
SHA-256: 0fbe59c5952c9421356cba936a5b00ad0a720ceeaecd3bdd818b6045922699c3