Malicious PDF — malware analysis report

Static analysis result for SHA-256 166a41a048196b40…

MALICIOUS

PDF

88.7 KB Created: 2021-07-02 08:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e3d13b13a8f3e43fe7ee3ea531555f11 SHA-1: 9d27a5178222072881a5aa131689e0cee1917477 SHA-256: 166a41a048196b405fbe330248227b48ba5afb21c5e281e191c4efd76235366d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and links to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://infrive.ru/uplcv?utm_term=race+cards+at+the+races PDF link annotation
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/22c96db528fab8ff4dd2b576c2847afa/guzipedonabotu.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be463bdc952---77154356805.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/dadebfe4039b204274190403d618774f/27836317149.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091c6e624cb2---47750395650.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/40bcda5932540928df471b80be56789b/89752255688.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/2085ac60d37f69b2a8af30eb35863acb/bijogusitomamatomurijose.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210629085446.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/28200272563.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/godigonopoliwesawuvenomut.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/omt7o6ondt9dq45ggiu5vagor9/16163013115.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9ef939c0d185dc0f45fa4705949c31c8/zekagimabisifu.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b753c74c377---35627264850.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083bdc7acaad---21698293761.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/a36tqh4ke58d0gv3c1rokir8en/60920726463.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/bigebamodilupofebogiw.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/5acc2c9e8c099120927aac7cd40321c3/57705556611.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021052323590170554.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/335b04eb85ea9fefea717af33f8b25e2/20459252032.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/37827351390.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/wabelowirumub.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/mumuvezax.pdfIn PDF document text
    • 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_off0000fae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE5 16884 bytes
SHA-256: 0359ea67342546d6ad98f99125e9a22725e6ea8d2d487d2a18d42cba627b6b00
font_01_sfnt_off000126fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FA 10148 bytes
SHA-256: f9032a76cb02b06d9eb132205db83bf7671e5615698db255dacb3ee499458dd2
font_02_sfnt_off00013dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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