Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9817ff46cb5139…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 19:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 516e5ac85ed86ad8154d30f62ce760f0 SHA-1: c605e906372a6668a51b02cedbab5c727902d750 SHA-256: 0a9817ff46cb51391674c437db74228fe6dece7f7cf605ada8b6878af743c0d7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting domains. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/r91r36aojg0o9j5ggbedonu6b1/91259139721.pdf In PDF document text
    • http://matsonconstruction.net/userfiles/file/26929821288.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210716_E11279257CD98973.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c2a8f22af---19325250834.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160946a0fcba27---tukodetaxulidu.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/gudiper.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a0a80394f---71212963542.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210615210421_3a1okx.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/34b267a5989ec4dd7883f170be505f48/mopogufikavatoririkala.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/47612530297.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/c2d344dfa92a3d39e50446387e321649/kumemudokag.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/danojoge.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/01589823d8de6fe1c507d8c5dbd5c66e/mogutapifij.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/g3mlqofb5cilq6cr2fcjq7qebh/rexujazox.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/larulexubasosawelefavaji.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/foturatimadiwiziz.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/xifuminezupodipinawurad.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/cedbe90af6f6190591ede2fe8e2a1a30/73251556118.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/d3c66fab0a9996946a5502670f7b5b87/38884727085.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3cb600561---80274245435.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210522074826_gzdtjo.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/71252522381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=face+reading+book+pdf+downloadPDF 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_off0000d969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD969 10824 bytes
SHA-256: 62417d977f65b6997456d662ffd24ef2e0ce77b8a420555b730095903ec3e6f1
font_01_sfnt_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A23 17512 bytes
SHA-256: 2cbb57a8c5e8b7ccf4b5d0ce453e5899cfde1455b8f08633f0824bb4f8da277f

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