Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f621dd046fa42c…

MALICIOUS

PDF

85.9 KB Created: 2021-09-08 03:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e254d37278fcb93607d94bd864695feb SHA-1: b3f0784adee60de03c073470291b96c4cedbac63 SHA-256: a1f621dd046fa42c1f4655ceac153e7854bcc3303f9dee955d385a3ba83e4f98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to domains that appear to be compromised or disposable, suggesting an attempt to distribute or redirect to malicious content. The PDF structure and link farm behavior are consistent with phishing or SEO abuse tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/bd30d36490031f6763965658020d84e7/81248825627.pdf In PDF document text
    • http://intertermo.nl/userfiles/file/40964981851.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c489d370437---90419378664.pdfIn PDF document text
    • https://daismene.it/file/zadatokupugotaj.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/44194831216.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/11755131405.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/fupetusuzukoputinaf.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a2a8b17e7---domawuzona.pdfIn PDF document text
    • http://immopolignano.lu/images/lukuziloxojevozawapu.pdfIn PDF document text
    • http://shesob.com/file/files/85591821832.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078441b069a1---gigebuwoxuwaxupuw.pdfIn PDF document text
    • http://midel.me/userfiles/file/wumova.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/jakawonazenu.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/nebexagegi.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/57c5c411ff3dcc2518cb8107cfebec12/23094264399.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4388d6f5936875752e2865599ad2ea4/mufevekisewoj.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/fb2fa355d698e5e5c2c8a87abadb3c50/xofurunexutomuvemutezom.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/47924496828.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/zufadorexekudifobeb.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/28084814635.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/50552080644.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/35662531901.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090ddb0b105e---11611267985.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/85212455924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=importance+of+informal+education+pdfPDF 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_off0000ead0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD0 17788 bytes
SHA-256: a36d355d4e0489341367a5c9ea02bc78e99ee81d1d6fa2fe65e812eb183b1517
font_01_sfnt_off000118f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001310a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310A 10664 bytes
SHA-256: c88ccbe4a64e64f0f998c5fd1a95698471320598c36d45d6a7ba4035e2436306

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