Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec8937c65cd56e2…

MALICIOUS

PDF

86.4 KB Created: 2021-07-22 13:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1b6fb25eeaee678458a4e6f770c901c SHA-1: 879c8a8b773f2ad077b3a218fb49295e0fc9b24c SHA-256: 8ec8937c65cd56e2652cbf0f3f753e7753c39786706cbc81006dce9dc731ee6c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic findings point to a URL-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7a21e1479---85723302037.pdf
    • http://cocoal.com/uploads/file/pawujarurexoderutim.pdf
    • https://prtl.pl/userfiles/file/vugegisuloxusijib.pdf
    • https://eobliecky.sk/userfiles/file/98498686456.pdf
    • http://alpha-cp.com/userfiles/file/62077267402.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2e67559154752f2a5202c567163cbced/5662145991.pdf
    • https://duproject.com/uploadEditor/files/58615167212.pdf
    • http://tacchigroup.com/public/thread/risorse/file/tozudogawa.pdf
    • https://gites-les-bardots.com/userfiles/file/zasipupuvixulunu.pdf
    • http://ahchala.com/img/file/69823744589.pdf
    • http://brukbet.com/user_images/file/29673779150.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/m2go6mrptekgmd8rc00ak58sk3/dasavotuzowinigosupobopek.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/1770275feb17f7050156f775c6722d79/rilufipi.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fec60b34e8---zuzifelibunaj.pdf
    • http://trunglam.vn/uploads/userfiles/file/xomonumit.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/54a20954cc8ed812f51a28282e6733e8/45875659947.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f600f41bbf---minisobokusurimuzefu.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/f74008c650687d2b4f399fb1adfcca3f/zosejeg.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830b1e37930---duguxodifununapal.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de352ea4d6---xiwutotedova.pdf
    • http://fine-cottage.ru/userfiles/files/18662994.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c175cd10b12---7632929199.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf46619e58---83553321643.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed93e7f32b3---remib.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=10+ft+lbs+in+inch+lbs
    • 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_off0000f0a4.bin
44e9af5cf0985cdb7202e3cde5ffd7c422308159c029b8c67986f1ddde68dbc4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A4 16832 bytes
font_01_sfnt_off00011ca0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA0 16792 bytes
font_02_sfnt_off000134b7.bin
600bfb39ee0fc46e6358e4b415c1d84fed8520fab501fe762f79e029bdddf045
pdf-font-stream PDF embedded font (sfnt) at offset 0x134B7 10136 bytes