Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2392d0dee0b8ffc…

MALICIOUS

PDF

83.1 KB Created: 2021-08-21 09:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: c6fe6d0b1bf948dcdd8b1eedab39ca2f SHA-1: ebd71692bae8d2b676fd0bf506d344e52bb0b244 SHA-256: f2392d0dee0b8ffc99b7d0c21cfdfaf17eb504d8bc5bad1f5decb5e5cbec1261
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://redigonda.it/userfiles/files/36615672887.pdf In PDF document text
    • http://www.deopendeur.org/imgUser/file/ladoxutud.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe899b53d1---48718494748.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8b47aa63a---31569168939.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202108/file/67090575094.pdfIn PDF document text
    • http://ezibra.pl/upload//file/fitulosonar.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/kezorulevogexudimov.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/86473872817.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/c938452e6e4b1f46711d4644fdcad8a7/xamijipofolabebuwak.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/82883962970.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9f1cbb919---sepuremadegowotevefoda.pdfIn PDF document text
    • http://txextremecarts.com/userfiles/file/35916232418.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ikg4hdd2oj079n6omkonqf4ju1/foxesolar.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/8401879820.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/2727000fa8e59fee0d01048cf209ddc4/zejopes.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/veben.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/j7dn9unnclapool3f5cktgqgn6/modiditegafotineborobos.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/dd494cb8a026c6b319eea0a672911468/wisupenezavona.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/debosinonanebijesijelixox.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/kumevinilovidew.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e591024a0---vadama.pdfIn PDF document text
    • http://preiss.at/upload_files/files/58025830880.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/purotivekefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ukvi+ielts+sample+test+pdfPDF 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_off0000e339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE339 17008 bytes
SHA-256: 00c08d487e24b9e5f5c22ec18db23f45027a50a6d66a8c5c99acefd78059e8a9
font_01_sfnt_off00010f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F22 10500 bytes
SHA-256: b6b3456d5949016e1982f58411e69d070189204f27ca190c85553db3e0d1e212
font_02_sfnt_off0001270f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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