Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc0a009d88402a6…

MALICIOUS

PDF

95.6 KB Created: 2021-06-28 16:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa16399e4c2ac854584e1713d012d89c SHA-1: bcf8a0be7b834dfdb66b8bdca3bac0111501d4ee SHA-256: 3fc0a009d88402a63da709c636884ac12e937585b0c79324186d8c21ef2893b5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c89c5f289ec---70365370591.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a79d8a305bb---fagamelanokemi.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd57e6c95---26536783636.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/vh50mn2b7kss1f4n8hdrjngenq/kuvovisidebajola.pdf
    • http://builderall.info/userfiles/file/82999127263.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16078735c8f30e---93914349344.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/fa3lbtcl0tmokl1mbhivct9v51/26635181105.pdf
    • https://bwawarszawa.pl/upload/file/30398589214.pdf
    • http://ibiforstarlight.ca/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/18051717788.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/kfl72t4t9n9cuunnvvpsjcibsu/45947288471.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098d65e037fa---mipuzuw.pdf
    • https://mihalex.by/files/files/10121338026.pdf
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/48022440985.pdf
    • http://sk-massimo.com/js/upload/files/17040280458.pdf
    • https://lionkingbali.com/uploads/file/sujateveribomoso.pdf
    • https://chp-travel.ir/data/file/masumexatarinixifatebusa.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed87ed630e---kolivelowifazovitozu.pdf
    • http://szao-spb.ru/images/news/file/vusuwaro.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf36c747f---67816487379.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1440c7305---20442400965.pdf
    • http://x04ydivan.ru/userfiles/file/domavul.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e15589e15---fevajo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=tenses+rules+with+examples+pdf
    • 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_off0001128a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1128A 16792 bytes
font_01_sfnt_off00012aa1.bin
9d2a9daeb14265a3a814b1a060d3e4019f5269fa3a6bc264f3dee5a1a9b81297
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA1 10892 bytes
font_02_sfnt_off000143ad.bin
3aecf6d0dbff30d1dd071cce2fe269b0b13afb0c23267ed956519ae44b0bbb6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x143AD 17552 bytes