Malicious PDF — malware analysis report

Static analysis result for SHA-256 4722d34a02e82537…

MALICIOUS

PDF

87.4 KB Created: 2021-09-07 08:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 949adc0e9463638ed4f5f2ec94ed5ee5 SHA-1: 92bb3f995b333281697bce9e892f7c6c0f327a61 SHA-256: 4722d34a02e8253729648eae150e3d8ac8db352366ce28cf89856d756a7bd2e9
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://artbynela.com/uploads/file/vetuwibakubadixigat.pdf In PDF document text
    • http://pkynfe.net/userfiles/file/37871511879.pdfIn PDF document text
    • https://coil.hk/upload/files/pasowemilimew.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607568d568f6c---26253061976.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/8fd4a42b214cd3f76ea965ddd3738ee9/dusijudiruzefujodebiwibil.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/fajodavimoxuganapo.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/8c5ce49cda3a6a7c42c90308fdc8de67/71541644347.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/sanisirelugezozive.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/bagof.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/totipopo.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/nilido.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608334e064824---32010497740.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/6c490146422d489aefac1fab8da2662d/mugomosawivagawirerefod.pdfIn PDF document text
    • https://ahha.az/userfiles/file/zujumusitajefu.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b1a03073f19c6425fce1281c9f227161/15349675735.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/58237112180.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/62095443093.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/56546092558.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/pepedusuxogoferoxez.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/84552469027.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bac6367a9c7---10537696816.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/rukalavefadexigofubogiwu.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/152e6279e7342717db86194498a50bd6/sovibijujutazizirunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=yokogawa+eja530a+manual+espa%C3%B1olPDF 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_off0000e966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE966 19944 bytes
SHA-256: da1f0e2663a63f2d7a513cca554f69948e859884b3af6a2ab7d288f40f1e6b43
font_01_sfnt_off00011bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD5 11332 bytes
SHA-256: 349cd49c83b82a38f748fe569958bdfae35b9f54104cc08bb37777c39c5940db
font_02_sfnt_off00013656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13656 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1