Malicious PDF — malware analysis report

Static analysis result for SHA-256 c037317b517a68a3…

MALICIOUS

PDF

89.6 KB Created: 2021-09-02 06:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3625e74b3fa38cf759b8b09c81b7d617 SHA-1: 28f3d78fe820035580607c5fb8574d6fecee1cbd SHA-256: c037317b517a68a3068326e0f612677754fb12d886a7306c270ef089aebf9f06
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to deceive the user into clicking these links. While no scripts were directly extracted, the presence of numerous suspicious URLs and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2fd425dbc---sabavo.pdf In PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160739ae36150b---liduw.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087d82c119b8---46293328612.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/9vi40vbg29332he4igj2779lp4/nupajuxebuzipobiv.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/jelokuxidifotoranelog.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/46ea7998e026f79e8919bea4814e6748/98208906941.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/66c11de1a288ac19e091776623599dfa/47654676987.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/laxagobakopigesijagudoban.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/48ec57808614d1d44b2e2a211a1e80fb/38188788188.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1acd847a9c0c4ec5bf1ba9f6029fafd6/50988931965.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/nolasovavevubufobirazigik.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/bilubabubamevoziri.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0a850c8f4---lutifitomurino.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/32f657ea589538f619e712d101111e38/lowupifufuxugobeg.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ev8ilhjq0frosg3bnrkt8chhig/xejukuva.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-8-23/20210823200043635052.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c59c05135---48616975450.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41c2d91c20---78783851373.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/fogumuwuni.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/7fd34ff9576ca207455b8b6daff1195d/28189092358.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/21288526246.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/7198548805.pdfIn PDF document text
    • https://airshow-bg.com/file/guwimefiwuwexalu.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/bac1i7kovumt9n4aadb3e0a039/jotibatelidigo.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/rlue8v4tmgt2rq9fmu1aqa6mvn/tezibiduputadusavikojoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=2+month+old+budgiePDF 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_off0000faf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF1 18112 bytes
SHA-256: 872383b297c1cd7e9bc92de9228997de70505232a2949438a32d7bf4688a7ecc
font_01_sfnt_off000129b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C7 10528 bytes
SHA-256: d175977d495974698a027c86340e578e966198c5a20b84f0e3b63e64de3bc787

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