Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b2c99bfc3bde78…

MALICIOUS

PDF

74.3 KB Created: 2021-09-07 19:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 05a94cc7f02333d8cfb8a170d79f0c6f SHA-1: d8ab3b16a225ed011d55db4a7236ede3de39b42a SHA-256: b7b2c99bfc3bde788c715c798953ec38afb96c468e0ba42b57a88ba993182f19
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 compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://marathonblainville.com/userfiles/files/xerul.pdf In PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160818d5d2cc7b---10272324058.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/361a666e1c12058a8f62e9fde831afb8/8339341797.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/bebudogowo.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/47926267522.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098aa3a68423---94397472304.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/wilosi.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///81764683646.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d00f5ef0579---90857196346.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/fa8b4c69e82a73d4372f9f989230962a/gewofevapirodo.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/4236626634.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/bobotodipaluvivadeji.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/guwekakama.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/67694f44173c491e91abf06bc5322418/8436645377.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/10115927035.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/j3p81acva75pjarjc87i3v70e1/232414022.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/gimagapazifozuvejarog.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/srl72n76pf19lskfql0olfnj75/14607837425.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/gowobamofuxe.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/eo25nvat5hiqob2lidh7fahhk5/talat.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/lezujasojaluguve.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607071d7d102b---38955394440.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d4ed6893---55691046899.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/19033622587.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/d7ee24c10ddb6dadc096ebcc85d2fc8e/kigizozukiverujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=study+planner+pdf+freePDF 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_off0000c070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC070 16804 bytes
SHA-256: cd1f8241c0fda71ed0ad12e0babd262c37c263b3052534bdc93cafa6393eed93
font_01_sfnt_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 10400 bytes
SHA-256: a486331644ebf7186169e92c951a3bf2341f80986b98365ae3de3e80aadfa898
font_02_sfnt_off000103b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1