Malicious PDF — malware analysis report

Static analysis result for SHA-256 566283579e2102a4…

MALICIOUS

PDF

79.4 KB Created: 2021-09-13 01:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 124d8a411ebc28d080bf1b11d9659019 SHA-1: 2d202a800b7ffb6f89415afa50fbf25e7f808d3c SHA-256: 566283579e2102a4053455aaedb1a05a3486c8d6dc8808bd54ae43a3a4bd29d2
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs, many of which point to disposable hosting or compromised CMS uploads, characteristic of link farms used for phishing or SEO abuse. The PDF structure and embedded links suggest an attempt to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://yjbiotech.cn/upload/files/97030634795.pdf
    • https://artesapanaderia.xyz/aym_image/files/16961993692.pdf
    • http://gearcon-eng.com/file_media/file_image/file/31823608860.pdf
    • http://adveotec.com/img/file/pepoz.pdf
    • https://visualmotion.nl/uploads/file/patasamogukikakik.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/9724929b0a376bdffa631e8b1794cd8d/lujotijise.pdf
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/13992416839.pdf
    • https://matharu.ae/userfiles/file/ruzorevev.pdf
    • http://www.la-rocca.pl/app/webroot/files/files/jivowunozuziwuvu.pdf
    • http://webinaris.blog/ckfinder/userfiles/publics/files/61111550643.pdf
    • http://nineslash.com/user_file/file/zuzawebo.pdf
    • http://langyupharm.com/upload/files/kojadazupawilinutuvoto.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e79840d3af---68032142507.pdf
    • http://stensoproject.com/userfiles/files/29469034498.pdf
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/bajilekalozufuwewuxigas.pdf
    • https://aayams.com/userfiles/file/virutiginajeragigabaz.pdf
    • http://ramenzoni.eu/userfiles/files/32804896318.pdf
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41885338746.pdf
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/gobogixa.pdf
    • https://pasarant0g3l-turbo-h1t.com/contents/files/93670895921.pdf
    • http://gowowdeli.com/uploads/files/gefugolejoj.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac961b0d9---76205697456.pdf
    • http://factblogs.com/uploaded_files/userfiles/files/kogabolimekiwamanutapi.pdf
    • https://warungmimpishio2.com/contents/files/jogusak.pdf
    • https://etravelbox.com/scgtest/team-explore/uploads/files/25938692532.pdf
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/4763762545.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=bunsen+burner+scientific+diagram
    • 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_off0000d0f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F7 16792 bytes
font_01_sfnt_off0000e909.bin
d0909df3d45de3d954dce04090bd8614214827fcb103d295433cffee77fa83ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xE909 17616 bytes
font_02_sfnt_off0001172d.bin
88c2045216ec25a4f67b6f0e1b1fbc5c53b2f0a215b061b3eb1f887626db76d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1172D 10944 bytes