Malicious PDF — malware analysis report

Static analysis result for SHA-256 855f779a3f452762…

MALICIOUS

PDF

71.5 KB Created: 2021-09-12 22:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0decc90c712c0ec7f3f07ad1ad2b749b SHA-1: 898fe183ee43db0fe032c607f568028b75697b3f SHA-256: 855f779a3f452762d1645f89d5e86f1a9f97c6d03b3d60b0a368b045269b8bd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted from this sample, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=watch+tv+series+online+free+walking+dead PDF link annotation
    • http://originalavto.ru/userfiles/file/34478474830.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc66536514---bogeridusope.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612efc914b68e---71051076538.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320c3146dd9---gegev.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210912231858.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c75c23245d---7519304240.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/50374134097.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/88778095925.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/mevolenagufubemeji.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/48344678275.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/mifumupovosaxedujibo.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/kiduzekipidixopud.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/37220766947.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/jezixudup.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/48183886245.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373cdf2cc4c---46543246413.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/43016600856.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/vubedabufegubetirikotegu.pdfIn PDF document text
    • http://keacg.com/upload/files/34810904142.pdfIn PDF document text
    • https://gulamanis.com/contents/files/minilo.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/mafuxaxo.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/ribitalubixeta.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/pinojulilimapizaranafaput.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/mexufir.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_off0000b558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB558 16320 bytes
SHA-256: c4a5792a4fc89563888d8a5dc2197eeed3474c53cc753a8ee3a3b369ca2559bb
font_01_sfnt_off0000df2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2C 10992 bytes
SHA-256: c631655415eb293b3fb363abf73a3ffeecc3b36cd28effa1ec85b8363bb7fcca
font_02_sfnt_off0000f889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF889 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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