Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7afca993db8a202…

MALICIOUS

PDF

86.6 KB Created: 2021-08-10 05:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8fabf9b2802c11aad095cf98456293ae SHA-1: a8bd3225fdfa272e0f89c8dd6fdb878e0cfc0bf6 SHA-256: a7afca993db8a2029d67862c150140f81e40b250dbe9149f6ec83dd1f8b55078
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/fhbk88rbj3gj6gmad31me8tdbc/62989243591.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/3182eef3f038d5e55757d6f5843e398e/joburegexoxiwefurow.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d898f1dc6a---buzoze.pdf
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/f7bc2d1d30b4a9bf840ee82018d97fba/46095513197.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901c16270f6---fubebokufopesifefedumizo.pdf
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dudoredona.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/97e2fca9f97c91ef2a91bd1d09c66288/guvevovuzinalewad.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0390748bc48df3be7a6fb64f588fc406/vigejedepokozo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d42c8635cc3---17781419946.pdf
    • http://asbufestival.com/uploads/FCK_files/file/sasajedasul.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/83975de4064f138b3fdc1c5fd8c7a4bd/damukalipazileworozaxenid.pdf
    • http://viprealestatebrokers.com/userfiles/files/xepadaladezibirolinalobux.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf4364a5ba---69454495185.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/a500a20c2f0b70207de984596b22b3af/xaludorit.pdf
    • http://aliceinformaticasrl.com/user/pages/23231825403.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609831076dc76---fezubo.pdf
    • http://thaihotelsale.com/FileData/ckfinder/files/20210702_17B1B8D3D21EFC6C.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbb28a37db491b5412502ef7e53279ec/3840331564.pdf
    • https://jordan.si/dokumenti/file/sotolimumuweka.pdf
    • https://tahitotfalu.hu/ckfinder/userfiles/files/46371620505.pdf
    • http://gianphoiduyloimodel.com/Images_upload/files/pufiwizawivapulif.pdf
    • http://zulassung4you.de/bilder/file/74280323764.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/flec2u57kqtbittr01ci027n9f/38263740926.pdf
    • http://steffis-strassladen.de/userfiles/file/37648329606.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+zoom+in+doom+eternal
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0bf.bin
c6ea799a56bfa1addca7d93f5986c003d07799f55c696f8435e6d74b1173d45e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 17020 bytes
font_01_sfnt_off00011d0a.bin
7e45b3c113f3b9f476899a78538c7fca4f7c07322f644193a78be8629b6d7a01
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0A 10376 bytes
font_02_sfnt_off00013474.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13474 16792 bytes