Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a8bac76536054c…

MALICIOUS

PDF

83.6 KB Created: 2021-09-06 23:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 602dc295abd2dcb21fa2d1bbeaf61bcb SHA-1: b2a5ef2fc68fdb1917e2693ad2fe6c64215b872f SHA-256: 67a8bac76536054c82d981bd1cdd098b54c15d10a7bc713766a7437a203f91fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised websites or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

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 https://krisoc.ru/uplcv?utm_term=talk+show+script+template+pdf PDF link annotation
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160acd88085d66---6071638833.pdfIn PDF document text
    • http://grupophi.es/uploads/files/pasizenab.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/gilaxepuwaburapasarukipa.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/2iek2cc00l1pf0tpfrpdbn3ao8/fuxejipotilunefodixoxu.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/u320rt8nc64lr03a11d62po27p/xapokimonijibiditut.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/81380851018.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/l40gn3d4g27sbsf45uep216roc/widevuzubopitowusipexir.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/nemofelulafifon.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/94056170775.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/20803399960.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/68820559338.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/ad3fc23ff38552bf6289ec102bc96b79/dixagamo.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ec31d221f630ea98ac6633fcba871e0/jobowasovadositekitoba.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/53317598647.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/ee3372f27a62ff62db73a5a0d2272b62/96219593281.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/mokes.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/6c0a2d42b9e4bd53849f33256e19ffa4/rabatuwuvodisefumuxet.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/3713584312.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/54894732588.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/4ac0bb4ea2ff4c80245a46062e8b6818/gejoxojumifemivubofozila.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/cac308ba4db94d105abf5075d8385b60/vazofap.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/68063936151.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/9541319344.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/wefugupukinimuwikujolaze.pdfIn PDF document text
    • http://kaies.net/upfiles/210706033957498281zz6r3t.pdfIn PDF document text
    • 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_off0000dd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD02 10920 bytes
SHA-256: fc31b1a5c66549c457dd95da1487299909d750baddaf616f04c8ca5591325adc
font_01_sfnt_off0000f66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 19592 bytes
SHA-256: e50a11deffb0241a4a06509095d8b3b0309ce0ba36d02e32dbeb80d362673030
font_02_sfnt_off0001286f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1