Malicious PDF — malware analysis report

Static analysis result for SHA-256 40990010f31bfa50…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 22:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 05b208c5b9664c6fd84dfef06a9f95bc SHA-1: bd75591dc954985b20913ce12953c47c2ddf8913 SHA-256: 40990010f31bfa5016deb619cea0c76f3d1c5789df81c9c9e5e009d6722501d3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains a link farm with numerous external URLs, many pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM indicates that some links point to compromised WordPress upload storage, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://sns.hu/_user/file/36606063503.pdf In PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/ganaxi.pdfIn PDF document text
    • https://seikai.jp/free_images/files/tadebumedesedej.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/seneberisopimogevix.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/30800308180.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/36541049494.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/6815875195.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/63932449497.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613613e98b5d0---zotanujer.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/32249542505.pdfIn PDF document text
    • http://beta-rc.com/upload/files/wekagi.pdfIn PDF document text
    • https://agrando.cz/files/file/vepasalolusagixefejove.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/8d6f484749deb0e305b8c8d4a4677b69/95015531642.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/75333595923.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/73816798995.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/jepojirobufomenidudode.pdfIn PDF document text
    • http://budropol.de/Upload/file/zutivi.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/52977693405.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613533e73c6c1---57772571094.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/16334768101.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/64593400232.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/934d7aff34a89d04b3a596e0ef770d3e/tapisiwage.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210905_3A90E9560B76F0A5.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=gifford+ulysses+annotated+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_off0000d6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DC 18208 bytes
SHA-256: 60dcfc787d55291b21220b9dd7fb02a9c4cfe608023aa438e9ecd0033153363f
font_01_sfnt_off000105ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E04 10744 bytes
SHA-256: a8a46eeb9afe0ad5e80736253787ba1381a798088850551be5477e1254325bc7

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