Malicious PDF — malware analysis report

Static analysis result for SHA-256 541f33917948328c…

MALICIOUS

PDF

77.5 KB Created: 2021-09-01 08:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a73fd3e0a0c5d1f2f96e3d48d28d2383 SHA-1: 97973b02f8f53a4917a9b4a0d754a9a854f87d8c SHA-256: 541f33917948328c1ffbd4600985046268b952f08f3f38c225a150539fb42af6
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable domains, which is a common tactic for phishing or distributing further malware. The presence of numerous unknown URLs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://www.bash.cl/media/file/refosebogatofesazifediket.pdf In PDF document text
    • https://actorconseil.com/files/file/1324077940.pdfIn PDF document text
    • https://businesslife.com/content/file/dinumivaku.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/lazigabibu.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/vegonolikosabijasememapol.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/82429903283.pdfIn PDF document text
    • http://chamdure.com/DATA/files/bipolujibuxem.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/vuzatunalupiwowezojixajaj.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/8470924792.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/0e81934d63f16bd9a0223b3d061283b8/vobavobo.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/orijo7ijh8p6bt0m7dba3ma89q/nakofewuzininodenoni.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/81879178772.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/an8t2u8tti1fqmgv37ral247qg/binetipotubilidufugaza.pdfIn PDF document text
    • https://panama4d.com/contents//files/rejinopajasikux.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/bd59f0d1ffd412296c41ffc8b837e28b/31347247494.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/4fc293ebd0b46add95d9a3b13e8f4750/14260976028.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949eab6a9c9---ruzubexajejarivoge.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/dudajovoxupebotowunepafiz.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f2b00751c---felulat.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/85970e53d80cf208bbed843d23f01ece/gaxupurinujapu.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/eda96986f3310ad462a5c9ca724d88f1/nosunabime.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/b8692941200be37a20164efb8eb33128/33350188147.pdfIn PDF document text
    • https://manenshop.com/upload/files/zerolomenajizilinudolidev.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1bb146b03---90671179734.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/91bdaaa64bfe763dc5b1e2a21d19ec82/dedelowagoramese.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/23980708743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=pull+the+plug+meaningPDF 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_off0000caaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAF 18084 bytes
SHA-256: c87bc78c9908a3110b5322ad8e3f3005f993a6c3922fe8287094c1eb69203b1a
font_01_sfnt_off0000f90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90F 10412 bytes
SHA-256: 13c1b8d3a52b1e41c200a215f3e53d234204598f98682cf58abe73a5ba8536c0
font_02_sfnt_off00011070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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