Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f693293b762334…

MALICIOUS

PDF

78.2 KB Created: 2021-09-08 19:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9cc0cc3e40565cd4754637c08e9356c7 SHA-1: ccdeec2686493a4d82f1c283959011a96b55b479 SHA-256: 90f693293b7623344f520bef066ca6c5d8d49b298bccd880ce83892edfe026f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ideylia.fr/uploads/file/21047508094.pdf In PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/7488271757.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/zirodakemopajilojile.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/sopeloxumosenilalufe.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/f2f6a395a92dc3646eed8067ae501a3b/vovuviwakodunipijuzonu.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/32858058835.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/xidukuramejo.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/fufawimu.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/xakotupinazibodefulexomon.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ckt17sd56ckat3hb6fvi4a06gg/piratusigofunusi.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/bikubopisar.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/40510333900.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/gugikan.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/81d5a232a7f3f2ed138bc7010724e9b0/32424285752.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f886eb64e3---69547183530.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/42800865235.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/68959824236.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210902040851.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/40816051943.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/887406897011630784023.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109061953106383.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324dc4e934b---navixix.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/nagararatelozozel.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/69324310119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=corvair+engine+rebuild+manualPDF 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_off0000d1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DA 16148 bytes
SHA-256: 3f89db0af3f77999e9eef4fde42fcca27c83dc4f8d140d5d4dc8a901e556a17e
font_02_sfnt_off00011324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11324 10664 bytes
SHA-256: 920eeb0b5236d5167cac65cd1d03571592f50637cd8e5021099f3dda28d4f062