Malicious PDF — malware analysis report

Static analysis result for SHA-256 3835f15151202cef…

MALICIOUS

PDF

72.9 KB Created: 2021-09-05 17:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 93bb5c15511c55e35ec9b0517e2f0bb6 SHA-1: 29da9015b25ed46ac1e129f84f184702cb4a2e68 SHA-256: 3835f15151202ceff3cad784d66307c3699c9769bcc3c8b1d7d18107056d4a3c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution lure. The file functions as a link farm, containing numerous URLs that point to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=modern+nuclear+chemistry+loveland+pdf PDF link annotation
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/4rrov6nfdj2dgf0jv3p2g5ts23/makudiwaso.pdfIn PDF document text
    • https://olterus.info/contents/files/47886945350.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/lifuxe.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/44364534664.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/cgms8slisr4v64mckc690moei4/98952435874.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160903fec6328d---4495459016.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/64061354265.pdfIn PDF document text
    • http://metapolar.hu/tmp/23674370535.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/266f7a3a65a673793ee1f4d9dfe78306/14610805727.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608a8ff15fefc---10163628694.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/36479093524.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/8417322208.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b6c63796ae429b43e5f58146c1266dd3/34321753274.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/86562358166.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/monige.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/28412363350.pdfIn PDF document text
    • https://petikdaun.com/contents//files/nukowakapowib.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16123ae68e0fac---negefekoror.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/d0e3cd737efa3a741a020c16f419bf2d/lopexagebirokupanuwozo.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/64upi1mk29upi2aha17i3r3oci/fagik.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/drov4an5cb0ef8nil41d7q4ff4/16898669425.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/88476514630.pdfIn PDF document text
    • https://ovalpolycoats.com/media/munogabobododakowo.pdfIn PDF document text
    • http://myqself.com/upload/files/67029227988.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9ED 16232 bytes
SHA-256: c1b120f706edb14ace7ca97d932975b9761ec89ef234045f22903b8e153fb434
font_01_sfnt_off0000e3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E5 11156 bytes
SHA-256: 47e6d7ea993bf29df862493c2f892c49812e004b231c5b5f33c6aefd7519f014
font_02_sfnt_off0000fdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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