Malicious PDF — malware analysis report

Static analysis result for SHA-256 db409c23ea29ce73…

MALICIOUS

PDF

85.9 KB Created: 2021-07-18 20:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 424870b6177d90eef897a735e0b0dcb1 SHA-1: fdf001c19c4b84b682102fd3799e0f38c0c76a02 SHA-256: db409c23ea29ce739d6fb1d974f384c9c944c7dce7fc7d0c9433046c2197f12f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. While no scripts were directly extracted, the PDF structure and heuristic firings indicate it is designed to redirect users to external resources, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://strahovka66.ru/userfiles/file/72271220499.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/29a2c5691a51474702ae96a2602d3a2b/39711713796.pdf
    • http://aaykpn.com/uploads/editor/files/13519466432.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d1lcd56n8bmhu6cf96k6j0uv74/faxazuzetuzakafarala.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1921869c80---viban.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8afc74015c30b82ac5a766503e18f1cf/15324880413.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/fb22f2af0f627f970f50246f12e0071f/rotedopajegus.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/f1cb1813af300cf763bd572afdd4a264/sofarenatofujed.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/0480869b14f5bd7d37f7bc751434dc0e/86951544645.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc87be8d09---39947424428.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bddc3e632---mozebemur.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2e47d14f7---pifogigijuzoviwono.pdf
    • https://masini-de-ambalat.ro/images/userfiles/82942332642.pdf
    • http://educationexplosion.com/clients/a/aa/aae59ec6301d25964842a0067e0ae100/File/91011626321.pdf
    • http://dentish.ru/ckfinder/userfiles/files/madexelaz.pdf
    • http://efuegypt.org/userfiles/file/76131122343.pdf
    • http://adlinefor.com/home/webagen/public_html/korn/data/file/2318035823.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829b06de0fd---gagixotexavibapakusa.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ca8e9448ab6---82413391780.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ba18f897b74---33764629569.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c67c6e7871---rexavodixon.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/b8027d8a770b993d55e7caf7e968fa11/56641132706.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/93ad1267eb92825bdb5b6db68e53797d/fimotupifujat.pdf
    • http://markone-tools.com/upload/files/wipajukotidolum.pdf
    • http://ambvet-trefontane.eu/userfiles/files/42212806657.pdf
    • http://huile-de-nigelle.info/userfiles/file/xukug.pdf
    • http://elesi.eu/fichiers/files/temil.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=services+operations+management+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed0a.bin
31f6be197401dfc1bd4660714d77bc4a2809ae745fa60de875d5dbf1add72193
pdf-font-stream PDF embedded font (sfnt) at offset 0xED0A 16496 bytes
font_01_sfnt_off000117fe.bin
abce4d54c28287ad59df3bdc36a3dd9a31e6bf5518c93535fa0ac4dbf018bc64
pdf-font-stream PDF embedded font (sfnt) at offset 0x117FE 11060 bytes
font_02_sfnt_off0001318f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1318F 16792 bytes