Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc90b6b1607660a…

MALICIOUS

PDF

78.4 KB Created: 2021-09-01 07:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3d1f2d3601969e649bcf1ed62167b76a SHA-1: 704e6994c56c885e3399ccb7e4c4d638db51aa84 SHA-256: dfc90b6b1607660af226f1e976b8f53dc7b2cf0b62df3a1baa332628f877c14e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDF files hosted on various domains, many of which appear to be compromised or disposable. The structure suggests a link farm designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://anmoul.com/userfiles/file/durozezi.pdf In PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/f7ppm6mdmv5v8so3g9sivkd3nv/3254253538.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/87268705752.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/07h40r7o783cddan7hg47v34t8/45258385331.pdfIn PDF document text
    • http://www.puhito.hu/uploads/8925180080.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/tiwud.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/xokevegemad.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/91455603292.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/kewoz.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/3d649109185b6f9c4ea458f8f7d94a78/pifojawer.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/87446105397.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/limusedesu.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/60334557153.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/49160846309.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/wovojexibumukeva.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/99f59bb1fdb75eee86bf303d94d08eeb/83924807592.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/513a18f51ebab7c2559779a7813533b4/66351398265.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/55790486450.pdfIn PDF document text
    • http://pasted-radio.de/web/files/nixobufuno.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/66046627.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/18089588511.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d825843a00---munorufumepomosud.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/uf1rnpnio4iamgb5oajkreifo2/dunevogotojodepasedaxidor.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/xupedonino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=travis+scott+ft+young+thugPDF 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_off0000cc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44C 17676 bytes
SHA-256: 7f777edbac881fbeeff8ff9e8b48becba967a46640063761399eee7771490d97
font_02_sfnt_off00011233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11233 10680 bytes
SHA-256: ef86af2a269ae21b2b3e7b965da78cc26ccb8ccacb48593938359c03e453f2a4

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