Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4d4fe2c70f588c…

MALICIOUS

PDF

83.3 KB Created: 2021-09-04 14:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c8600ee44be68a039e0f243621bc9a9d SHA-1: b3a699196b1af3cbb09c4e495662c60eac18bbfe SHA-256: bf4d4fe2c70f588c9c8e45661fc733384d647e9006a051048a3e97de7b730382
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to lead users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://fli.edu.mn/ckfinder/userfiles/files/gemisuwiloreveg.pdf In PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/46658f97e77a3dfd88d39c1fa2cec122/fadadoxeluperarononezafo.pdfIn PDF document text
    • https://energooptima.hu/upload/File/28888386249.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9ad41d3e5---33540934136.pdfIn PDF document text
    • http://unseretochter.ch/images/file/kefubonumutibanutewu.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/legoxijolidasevo.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/jakun.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/fugalubibumakulapez.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/jijezivufamuduriluvitop.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/xexasawupexivuw.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/pisefiwajewomidu.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/38p2kau8tc505tfarf8s09s1o5/tudonigiwarid.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/zawalisod.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/nkhp44li957sg9q2llebb6ice0/lasowakoramo.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630429563.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/83785192583.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ee459831226---59851990616.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076c023c5d71---14948603661.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/21067778886.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/de7f23d7c7246986aca90dbf8c9745c0/19461300468.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/81466714477.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/6b00e8d29f3a95c45e87bb58e15b855f/jororerididoke.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/rezadifalimi.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/73487593032.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/db0d9107d599383cb5dc04274457beef/ridipilotilinok.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210731145903469021xcyjxk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=transitional+housing+business+plan+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_off0000e138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE138 17484 bytes
SHA-256: 740fbac7e73c1708f40d58fedad790fe6435e72b816af17fed538aa8b01c0600
font_01_sfnt_off00010e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0C 10980 bytes
SHA-256: 8d95202022739f48095b935ae8dfb679019d4ac967686307e7c6ebb1f05088a0
font_02_sfnt_off00012708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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