Malicious PDF — malware analysis report

Static analysis result for SHA-256 290f576285df4273…

MALICIOUS

PDF

71.5 KB Created: 2021-06-29 17:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 958761558e224a13a1d8ac38b5120f6e SHA-1: 498682b57a9cfe3da8f4438ecf5b04dacf40a8ec SHA-256: 290f576285df4273ea1a0a1232f4ecf4955b572e9b027e9908da397cbb73e937
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, indicating a phishing or redirection attempt. ClamAV detection and ML classification strongly suggest malicious intent, likely to lead users to malicious content or further compromise. The document body is unreadable, but the heuristics and URLs confirm a pattern of redirecting users through a network of sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/af5e8177b73ba773cffa70e63f1aa2de/nijiwomalogisejajiba.pdf In PDF document text
    • http://alliusie.com/userfiles/file/lesudexurix.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/fawaxusobebeninasilup.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0966dd46a74945571d8588d93d43c390/wusizakivazowogokekekopin.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/gatorejunuluvumejezozate.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf3cd45f22---59707245198.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/argk7ih92vp35r1i16eec47gl4/lamupobe.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/5jborf79g2c4mo6eq4d3r9680h/12385901594.pdfIn PDF document text
    • http://bulmarconsult.com/files/74169672478.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/sagifulimukuwimeja.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/43290236236.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/a32ftjaf7hu32a2jk4jm4fldk6/gaboputobukakiliju.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/5405e012f36254e150b6afa009784f15/lazix.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a0c6d2ae17cd64bc0bf75c942fd6c22e/vanusidosazivowizavarire.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad49265b3c4---zinesopaso.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/96519365418.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/33360082527.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/4e4ebc932ceea7c3f25b192c072437b7/81910569052.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/8r7brg01ler70cqrf22ko1inb6/gogileginidukax.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/7t9oe40edknema1s1td5ak0a36/pikowa.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/9e2v2gfqfremsgsfegn8b4rka1/zevokakipukugote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=waste+and+disposalPDF 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_off0000b9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D3 10276 bytes
SHA-256: 233d6c96cc782bf10202003e3e8c8a699a75f189b1bf9bba476333e403b9f2f6
font_01_sfnt_off0000d109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD109 15696 bytes
SHA-256: ccaebe97e740fb5867b8584373d60a07ef03c74103e9fa063863badb657f0a98
font_02_sfnt_off0000f92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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