Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b6f73c016eab6a…

MALICIOUS

PDF

90.7 KB Created: 2021-09-19 01:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e5f15a2f0b9daed123480bc621fcee83 SHA-1: 4b5097af0e8252fe5d15ad50c85953be8c51ae37 SHA-256: 04b6f73c016eab6a20f9e1218f3a4f3d0d72c16aa6fa048ffcb09bed1f793759
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious content or downloads. The document body is unreadable, but the structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fab714c6f6---82805625297.pdf In PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/f41e63baba6e994a1b4d1dfbd82c1878/84777333778.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16140da7a34869---tijepupazuduzegasemakemi.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131707dd19b2---94863312196.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/21637354013.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210919053757.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405b618f06b---leboz.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/pobupozakelidopi.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b81565ad1e6ad3819d4bdb254af5ffec/3722168391.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/guvudetunafo.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/17430391864.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/71972142428.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/tutodijasugagaraxorozama.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/rejipelekazusuresu.pdfIn PDF document text
    • http://aa-nusd.jp/60822823465.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/nebigikixepibex.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/f472a58c57c1d2708947ba4b55e5c968/66268962492.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/loritunifupexip.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/lewoz.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/jivomogu.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/tejufudoxefanegesumubijim.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/926f7f89a1a81aec7fa4c5abdbb5be39/bijoterabeb.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/16553709150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=data+link+layer+functionsPDF 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_off0000f8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D4 19668 bytes
SHA-256: 41899774ffbb0aa2b3da577353ed7e4e24dce49b683c06fa465e5c11f7011b33
font_01_sfnt_off00012c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14469 10636 bytes
SHA-256: e77f15d8888b50d9465dadffaef1ab2b9c284473965696d1bfbb868fc7c941f6

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