Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2971946b038c25…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 07:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 79dea7f2ba7953548a80fc12315eb98c SHA-1: 7d63642e6b9100e1e185688fb9c0633fb4887230 SHA-256: 5d2971946b038c257fe559f56a9bf3355c59fe337ac109142b8a7db1f5a6b6d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=play+store+robot PDF link annotation
    • http://zerosquareonline.com/file/zonazeriwakar.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/27393322294.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/gavotabotavenarotenenip.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d8c706f03---9256242032.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/mafevegepuvofobekorivan.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/24482540743.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/bd61b3438bb8c14b62c3cd9ae60681e9/60150133815.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/f26bab58835cbf8cdb2dfa3a2d9d7177/13702644663.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/nosazawovedoregoniluwozuk.pdfIn PDF document text
    • https://clubselect.ro/ckfinder/userfiles/files/xititorisakemomiduligupir.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/pogulenetoboz.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16146fe2b627a5---xuburusepidumu.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/ruvalonavevod.pdfIn PDF document text
    • http://leruichem.com/upload/files/84350491281.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/30232786667.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/dodoxujidolaje.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/20701422142.pdfIn PDF document text
    • http://ceroki.com/image/files/21204310326.pdfIn PDF document text
    • https://sapthagireesyathra.com/userfiles/file/11635938563.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/7df52652ba36608f2f3c95e9258c03fb/6855861288.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/48032750414.pdfIn PDF document text
    • https://portoggitter.no/content/files/userfiles/file///29225008430.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109082022014662.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_off0000af1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72C 16460 bytes
SHA-256: 207ada9f82f361280b8a57189ebf2191f8739beebd9f3bbb1a3e35ec13190e00
font_02_sfnt_off0000f0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EC 10160 bytes
SHA-256: df210abfe0242a7cd14bc1021ab76b9f82c70a4e074a751d2667a2a06b7b655b