Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf317119ac06a226…

MALICIOUS

PDF

83.8 KB Created: 2021-09-16 05:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 548e4f1797d37c775374cd028dedbe9b SHA-1: a541fc837c0e239ed26c9d90ca1fe0e8a43f4895 SHA-256: cf317119ac06a226faf55561c6cbc220cd09f324e177a5c572d3b5a4806330ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting, forming a link farm. The primary function appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=hairstyle+according+to+face+shape PDF link annotation
    • http://mecaniquekd.ca/upload/file/96054462917.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161409cd7dec3d---memukebedoviniravovafeti.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/midewalijowesilinit.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/82440528064.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/61829364634.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/72651886105.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/rupogawovubekodab.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/77730340300.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090922293473499.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/18288784806.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3fe577fe0ce7a75388b9629eec51724c/sojalonesojol.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/rupunajaguxulemigeg.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/gukez.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/vujepugutoxorujamurok.pdfIn PDF document text
    • http://iccarrentals.com/files/file/joteloxonedo.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/23799875273.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/1675263579.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/18698290292.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/jesofopegogininom.pdfIn PDF document text
    • https://vitanov.rs/files/47694278716.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/jebazevepidevis.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137467155d89---sugubewuxikigavipawuzupa.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/zivedumusosufufeso.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 18272 bytes
SHA-256: aa5eb465200c4b7f741b2d24a6c3b44ee6532c86c17bcf87fbe964f8511a3aab
font_01_sfnt_off00011033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11033 11004 bytes
SHA-256: b54a6a22bf9e5714b93ee0c6c00ed2c03fd2b458f528a929a251dd8ca3ffd0ca
font_02_sfnt_off00012981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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