Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1f2b5e9956988a…

MALICIOUS

PDF

79.9 KB Created: 2021-09-18 18:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53adf79ad3fa77351540b77b86cf5e5b SHA-1: cbbbd0b9a2087c752ff7b3058bc222eec4670f6a SHA-256: 4e1f2b5e9956988a48451762df6838df5a43b09728754e80323915345664f389
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads. 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 0.9977

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://generaltubi.com/container/ckfiles/files/87146222075.pdf
    • https://basalyemek.com/ckfinder/userfiles/files/vepokorilesagov.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161413eecc03a1---zunutoliju.pdf
    • http://gldbirdgel.com/user_img/files/wodon.pdf
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/fabivavokimat.pdf
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/wupupawadujigovaxaj.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/89dcafdf7214a92f68a0b3122b7736a0/25957254208.pdf
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fakepasufulo.pdf
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/zaligija.pdf
    • http://centromedicoveterinarioadda.com/userfiles/files/vefarawalukebutomifedom.pdf
    • http://fxlcd.com/upload/file/kexen.pdf
    • http://5m-tti.com/uploads/image/files/pafugapetoxogokavuxiv.pdf
    • http://esenkardeslerinsaat.com/resimlerfiles/kuwajo.pdf
    • http://acm-medicali.it/userfiles/files/6114542810.pdf
    • https://oceanflowerhotel.com/uploads/image/files/81516676029.pdf
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/vuxiga.pdf
    • http://tscyw.net/userfiles/file/20210915220610_zmz8ip.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/manopujasumewonenik.pdf
    • https://people11people.gr/uploads/File/94261606470.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613df48e9b1e7---negetufag.pdf
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/35192406136.pdf
    • https://techlan.pl/files/file/tubixomedofevidegadalowe.pdf
    • http://cartopack.be/Images/file/ragurilejelabulu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=hd+videos+downloader+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B8 16792 bytes
font_01_sfnt_off0000efca.bin
a665402b4200fd6602e95eec20b364c56fc6fa6e07402a33fbf7e7b83aeef8c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCA 16468 bytes
font_02_sfnt_off00011a49.bin
8148375e995f32de418daa93fdf1f1f1b09561b37a8cc6b2da5468385f812ba8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A49 10392 bytes