Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c9a5c58302959f…

MALICIOUS

PDF

84.0 KB Created: 2021-09-18 05:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a575f8bd9c4ef79a6a57b3cfa14a662 SHA-1: ecffdf7bce2a980a331844dad54e7d28c3dc9e99 SHA-256: f5c9a5c58302959f556a3b124f779d7a2bb10d21844a1d2b0d332065d481955b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous external URLs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://garglob.ru/uplcv?utm_term=best+offline+music+app+for+iphone
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/mowofuxolegininupik.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/829b5736beb91472b4120eac125f8a67/2663024347.pdf
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/9037297022.pdf
    • http://epmachine.ru/d/files/16733043624.pdf
    • http://coachhouse.info/assets/file/vizopal.pdf
    • http://tafgambiatours.com/userfiles/file/pobajisetumefibemafebu.pdf
    • https://baoholaodong24.com/userfiles/file/linolu.pdf
    • http://riversedgefm.com/files/file/mojonewesejoralad.pdf
    • https://vcvscr.cz/www/www/fckphotos/file/tefefa.pdf
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/89904666040.pdf
    • https://sambelteri.com/contents/files/nedanodotapafuwid.pdf
    • https://hebatkeren88.com/contents/files/75809956792.pdf
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/xaxodenad.pdf
    • http://93564497.com/userfiles/52338816329.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16141699a12e92---kofumizenatimidokip.pdf
    • http://coimbrasoftware.hu/images/uploads/files/batatiwotesug.pdf
    • https://kaptenhoki.net/contents/files/61634266777.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/029026b2913da635d53bbb3f22651885/tobofojam.pdf
    • http://bielle-srl.com/userfiles/files/gejup.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/tb6u5c16ci1jbqufj54rqtomn2/30716166942.pdf
    • http://cesishotel.lv/res/wysiwyg/file/rabanajejarejatejuje.pdf
    • https://tezerwatch.com/file/upload/files/09-17-20-52-58-92.pdf
    • http://bafiti.com/sklep/userfiles/file/dakanowinurer.pdf
    • 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_off0000e3b2.bin
e28d7478c0e5966a883422380b1290de4af22ea07b0aba8fddb5b65d2e3f0171
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B2 17616 bytes
font_01_sfnt_off00011169.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11169 16792 bytes
font_02_sfnt_off00012980.bin
38dd37b9f3ddf242a23e6878df061fedeeeafb5b6d36489e7a3a736474b3e244
pdf-font-stream PDF embedded font (sfnt) at offset 0x12980 10900 bytes