Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1fc317f992fbfb1…

MALICIOUS

PDF

119.9 KB Created: 2021-06-30 20:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 147287f16c752b8bf3b93694e9e58dbd SHA-1: c20511a999765180ba156d102967cd3b75e91e34 SHA-256: a1fc317f992fbfb1275657f85c37480b8596f5a298c2d338b21465f8d6d18186
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ce4058e5d---nulukovu.pdf
    • https://angkoronetour.com/userfiles/file/47898250859.pdf
    • https://aihr-iadh.org/uploads/FCK_files/file/zimuvat.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b2ec35af0---58926292421.pdf
    • http://videofilm-tv.ru/content/File/mafijo.pdf
    • http://luckdidea.com/ckfinder/images_store/files/molovurivus.pdf
    • http://kopdesign.nl/userfiles/file/39597367943.pdf
    • http://www.emailposte.com/pictures/74320950403.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b4857e69ab9---kukavujisifetaki.pdf
    • https://dbmotorbrokers.com/userfiles/file/bijusedozug.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce4a5d0f54---ruxajenapofij.pdf
    • http://hzkontejnery.cz/ckfinder/userfiles/files/giwobubusoj.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-5-30/20210530022407161497.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/0adeed7e233c3b536ccfd0039c2ecfd7/50263341423.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c56d37a63e6---22584907256.pdf
    • http://rollfactorytogo.com/uploads/files/sotijuzor.pdf
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/89345549995.pdf
    • https://vatlieutaphu.com/upload/files/58120645472.pdf
    • http://firmen-bekleidung.at/userfiles/file/fiwabevinogepa.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160bea5bd21760---rutozexixegabuk.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d82932e1745---44606912016.pdf
    • http://mywayrtk.info/userfiles/file/93033665131.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ab0337134---97824635979.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pitcher+with+7+no+hitters
    • 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_off00017560.bin
0d23879ab42a3c0653b2289098cd3caa4e2b4ee356dc82427950ba30e911e55c
pdf-font-stream PDF embedded font (sfnt) at offset 0x17560 17956 bytes
font_01_sfnt_off0001a367.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A367 16792 bytes
font_02_sfnt_off0001bb7e.bin
98a5239eabdf01c2b3ffc6e4f3b6d34e721e9cd65165b27ac4db905d21eeda06
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB7E 10256 bytes