Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b51e423dd313f7…

MALICIOUS

PDF

87.2 KB Created: 2021-07-10 10:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9be8ddf0e585cd59f01f71779838caea SHA-1: 486bce971703e0bfb0a6f75e487c852c5073af7c SHA-256: 11b51e423dd313f70d1aed9039126fdd35d76a8bd2c59370d0240eb775605c2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous URLs pointing to PDF files hosted on compromised websites, suggesting an attempt to manipulate search engine rankings or distribute further malicious content. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/0fafb65741a40af8524a475d462528af/bomolalajudurozej.pdf
    • http://sartoriaventurini.com/userfiles/files/70921140581.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/i1elg2jn0qq75ubv2nc2913jha/murasoperufe.pdf
    • https://aljazeerahdrilling.com/userfiles/files/71251008633.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871616bf631---wewaloterovefobebipa.pdf
    • http://glotecgh.com/upload/editor/file/66904536352.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/5vtdpmbasg21ve2b0uir4m4d91/xalaxuposalabijisorezow.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/43e5a9c0fe69be82cef825f91ad62b07/pixuf.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fda4e7c59c---potiwitoxisasumexivukaz.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfab5c3598---26927805942.pdf
    • http://agroanaliz.by/upload/editor/files/pekogofileva.pdf
    • https://mayurherbal.com/userfiles/file/sufipurunobekoju.pdf
    • http://kotolantopeni.cz/file/taruveveb.pdf
    • http://renovator.cz/files/file/33590280747.pdf
    • http://udmvdpo.ru/images/files/jolaxumuruliwosulexe.pdf
    • https://feng-shuiworld.com/userfiles/file/98882167294.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/pejunutitefagum.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a377cd543f8---tasuluzefov.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0b234cda76db8f91d8a590ef09f1663d/domovum.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985d5c91a17---valogigakakunobaj.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/573368ea33ede086fe730771f979a07e/jebagivabegezalosugowa.pdf
    • http://cnmrobotics.com/files/files/kuzenigegojizugudagarim.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=homeopathic+medicine+for+breast+engorgement
    • 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_off0000f30e.bin
2c1782a00c39dda320e95f1f2cf7380e8edda6ad29caeef4db8a8f0c71225e9f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 11152 bytes
font_01_sfnt_off00010c75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C75 16792 bytes
font_02_sfnt_off00012487.bin
33755f1c9d152073096740fed8705359c6da1acdb46ec4f5536e946c8bc74aa2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12487 16544 bytes