Malicious PDF — malware analysis report

Static analysis result for SHA-256 231d36dcafa7e240…

MALICIOUS

PDF

120.6 KB Created: 2021-08-16 21:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: cb2151e1c41b6d889b88e995c36e816c SHA-1: e83a4e72e0c85101b7aec388a88bd0bc0d545c01 SHA-256: 231d36dcafa7e24020ab2882f299cad4b1df63231dcfe7e6cfd2644825ea35d5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://antonio-pelella.eu/userfiles/files/2559239201.pdf In PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0ba4a550e---midupogawuxikalobarawuti.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/kazuninozosulowota.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/12014000429.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/5ikqaju5o70qmak4t28u4l25q1/birilofoko.pdfIn PDF document text
    • http://vangphugia.com/userfiles/file/77367423795.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/xokusabotobosefix.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/pelamujefukedisilo.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846ca200110---biponor.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/2im2i757p3tdq34p92vomrtbgq/5686366789.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/64dcc38c073fb32cbd3ac875bb6c4ae9/53524316089.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7075c8e87---nebebo.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e40ee8ce5---pipibegijepuva.pdfIn PDF document text
    • http://erex.hu/upload/file/94299735709.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/6938198331.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/vaxinodikobozusakisu.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/zamoxemexunorureluf.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/tutonujiwiganirogidibilig.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/41329720360.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/343200761806a60fc4a125e64b728191/nanugamepuvosetunogilav.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/tcrl0u4qq3u8jvfqhd5cjomf89/94427607657.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/56277802025.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/a0b7bce6b0aefcfe594cc8fb07c73720/niwiwawevowikerexujok.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160755dbbea114---19410655046.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/71881070753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ejemplos+de+ejercicios+de+fuerza+absoluta+y+relativaPDF 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_off0001702a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1702A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18841 11272 bytes
SHA-256: dd632c9adf417b3b5ce688434aec7f643a79f25c76258f92049390a14d4c9faa
font_02_sfnt_off0001a28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A28B 18956 bytes
SHA-256: a0812aa7653eeb884daa62d49ca4a2d58deef8c683148b207eae23ee03e029a8