Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c921758afe6adb9…

MALICIOUS

PDF

89.0 KB Created: 2021-06-25 19:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 21ef67343f8b8b939a4269403e4b6a06 SHA-1: d2f2d68d256c4fd6dbda0fb53781919be2698dcd SHA-256: 2c921758afe6adb91601a7c9bf46b1fa7d3875677ebe350ae09aa546d9ff21c3
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://bbpcosmetics.com/admin/upFiles/2021-5/file/64973591879.pdf In PDF document text
    • http://peak-experience-japan.com/75245811524.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/96439512312.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/vefozasurifoguwevuz.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/95040343718.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c76c0cb408d---84263806634.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcaa2595a6---jefubukubara.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/9dbe44af1118c12ac868bbfce1cbc622/15834414553.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f5a0b160a---jiveruzeku.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/48532fed89f669fea7238f2d0bb9f868/tarigitumelix.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/36447165878.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/05v0fq5u2up9ee88kimj47pci2/divopepulasezokebegap.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/58422993711.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/hln3e4v4i38mh7me9mgqif7hao/24079382574.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/55567671272.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a0b0688d80edff9effccb7f2707eb61f/kasamifobekaluxa.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/xozejizuliwojazabe.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210530093253.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/vukubokozenapuw.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/58088f96457219a780fdddee85aa0786/97242111010.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/rovog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=converge+connection+statusPDF 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

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_off0000f36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7C 19456 bytes
SHA-256: e1251f1e1ce28e26669ba2fd44ac60b8a5b710e180b00554046838cf47341e7d
font_02_sfnt_off00013d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D32 10556 bytes
SHA-256: 8f3720759b2e339e5ffbf3c808747e980ec0ee0ca6b67aeeb883521c5cc8a32d

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