Malicious PDF — malware analysis report

Static analysis result for SHA-256 5674107a4b0db0b6…

MALICIOUS

PDF

89.2 KB Created: 2021-06-27 18:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95faf97b1adc04b8cd994a1916555429 SHA-1: 56212cb7ae4eb4ef1f112c1b7aa286833b4584d5 SHA-256: 5674107a4b0db0b6be23f77561f80e9c6d57a2f4a5008bfb28216867dabfed85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or link-farming campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely intended to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://cructi.ru/uplcv?utm_term=let%27s+fall+in+love+for+the+night+ukulele
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/9e6d6779010072a80a2eecfd7b868132/99196897484.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608078f932ac2---ragamofewinotedaxaje.pdf
    • http://qiangka.com/ckfinder/userfiles/files/pikikuf.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092868cb9b7a---xejibavewaf.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/40e833552916edaea8382623c80a8e04/garupamapowitaputi.pdf
    • https://kodcomputers.ro/2664/uploads/37061559563.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089522dc3afc---63348830379.pdf
    • http://amirafouad.com/uploaded_files/file/7868044929.pdf
    • http://fipjp.com/userfiles/file/xuzupujizuje.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/045edb7f2miv9auf40spkvvdo0/11908842969.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/dsq6nl7pkj1p2140ii1tflaeo4/kovugipi.pdf
    • https://sbufficio.it/file/65462960625.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/slph1nc9ok0bhfc3vq27pfaaf0/sutowizifutamukekasamun.pdf
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/tewewiv.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/cid2ut0f3qruc6oglnm54f1md5/tamojep.pdf
    • http://mooneyes.pl/userfiles/file/64284812800.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160842a46bc496---lomutobetazopuzero.pdf
    • http://doktor-okonski.pl/uploadimg/file/bisoxidijalomepivibefevu.pdf
    • https://detmers-kontejner.hr/files/96815789607.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/2f7a108aa8e4c57edb345d48a7dbde6c/65633654726.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a37b9268ae8---43631446935.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/282dfb477ff5d32a28540555feb8dcd2/ripuzutilufuxama.pdf
    • http://augustaelectricalwork.com/editorData/file/74368360657.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af922509bb3---jepikixoxixaf.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef15.bin
2d14e9faa7320fbc4e71221d3b14fc31b78d6e4564f9fd1eed175aa0d74b9286
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 17064 bytes
font_01_sfnt_off00011b7e.bin
45f622e89aa9e1a20e86360016fd51c405d8ec34e4777b951bf46ed0c66521c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7E 1860 bytes
font_02_sfnt_off0001243b.bin
8371242425c892f2d36be41e31eaa04fd45752ae3692640a1d24978163591d55
pdf-font-stream PDF embedded font (sfnt) at offset 0x1243B 10740 bytes
font_03_sfnt_off00013cf6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF6 16792 bytes