Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b9c4fdf6208e50…

MALICIOUS

PDF

79.4 KB Created: 2021-09-01 20:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bad4fa3b3d18b29c5985f432c014fd7e SHA-1: 186f4ce20b30628a202014c5004caf9c34626433 SHA-256: f6b9c4fdf6208e500aac47a4274f1945d1eff147c7d43feaff7d1d102a32fe6d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads, suggesting a phishing or redirection scheme. The document body is heavily obfuscated, preventing analysis of its direct content, but the overall structure and URL analysis strongly suggest a malicious link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608639721513d---rinaxalokoratiwawarirowag.pdf In PDF document text
    • https://toskov-yordanov.com/userfiles/file/vijefuwi.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/36279036696.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-26/20210626202020866675.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855f0f2566e---vodoj.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bde55076023---43227118719.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/33994777942.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879efe780b1---rarem.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f33f1d96c---kiguwokoma.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97ed6ea0f9---40295146322.pdfIn PDF document text
    • http://kururlaub-ungarn.de/bilder/files/papus.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/2fa3558b12c41fb0b7e5b186c8cc5a23/kaxinoluwezeluwotuzonaxu.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/suluf.pdfIn PDF document text
    • http://balone.net/_upload/file///75073730750.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086badfd28fc---jotowetupudukadavuvej.pdfIn PDF document text
    • http://esipro.be/userfiles/file/94517871578.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc1250628b---gomepebovetejolatalowabud.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b167b6af4---58655845024.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/02d3f7b7d300d17a6354cc1940144593/gutofibasusoduzijevudod.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/konozimofogafirekiw.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/13976750256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=super+soul+sunday+michael+beckwithPDF 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_off0000d0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C2 11388 bytes
SHA-256: 3af28c475d5d202e24bfb1dc3f1ba08fa900db36bae9e3a8b9f01708983d6fa1
font_01_sfnt_off0000eb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB38 17272 bytes
SHA-256: 924c4988c70fddfd373a0acd2ef758d77c5578325848504523befb71e9cc7680
font_02_sfnt_off00011771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11771 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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