Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fed03f17156432f…

MALICIOUS

PDF

76.6 KB Created: 2021-09-05 08:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f5856112121609fcecc23192cc58b74 SHA-1: 882247bf0a48f266eb6f04e95afb2182795a3ca9 SHA-256: 9fed03f17156432f7efb580730c69bf957bd55cb5efb6eea8d7ed1fad19e1a95
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it's part of a link farm. The primary purpose appears to be redirecting users to potentially malicious content or for SEO manipulation, rather than delivering a direct exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://shinex-auto.com/userfiles/file/57159915451.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/db45d0a4eab09858307190b38278f4e2/rupabuzaxaporig.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/d8a4bc4e0ac65104ae7017ff1030c26e/rujevulalilujunalerozigos.pdf
    • http://palaciodelosnavas.com/userfiles/file/87663342063.pdf
    • https://www.almuhja.com/ckfinder/userfiles/files/wironak.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/e690d80227dde931c7843138343f638c/33655028531.pdf
    • https://atpl.aero/ckfinder/userfiles/files/pifugifanuleguz.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dee1712f034---69982636384.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/p074j2osrr7qjui82pif401pc4/zamukebaxelatup.pdf
    • https://qualitymattressfactory.com/admin/userfiles/file/78457146792.pdf
    • https://proektasis.gr/admin/spaw2/uploads/files/nifuvozes.pdf
    • https://sanvexe.vn/webroot/img/files/26253018488.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4ea907d28---ponavuk.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/40719f25a40e5a717aa54ad090d5b0b9/18016620281.pdf
    • http://naucseto.cz/storage/rozebuka.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d69062f5f0---kubobaxuzemitomes.pdf
    • http://buckleyfamilyofdarling.net/clients/0/01/017bf228c8331327bdfb67b1798bff80/File/nobunenesatad.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/70b462785f3364c55726425591644a6d/89280449738.pdf
    • http://drivescuolaguida.it/userfiles/files/mivekedugulasawu.pdf
    • http://serbanindustrialconstruct.ro/uploads/files/polaruxeri.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc5fda3735---katis.pdf
    • http://studiosimonepantaleo.it/userfiles/files/39377060162.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/fsujqvrh2v9gni5b4170p2b1to/41978024331.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=nikon+coolpix+b700+manual+portugues
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c764.bin
f5c0beca6848256902a83fefbc88f86c60089d00eeb64fb6d97b79ece316025a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC764 11300 bytes
font_01_sfnt_off0000e1c7.bin
6c38ed92a5821fc573ea254f95c67bf45f5ffca6bf9fe18de1300fde8274fd6d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 17180 bytes
font_02_sfnt_off00010dd4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD4 16792 bytes