Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41d41407ed0492d…

MALICIOUS

PDF

93.2 KB Created: 2021-07-01 17:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca1f2a3e9add1a5330142d560b341e75 SHA-1: a4c9cf06116af45a360c101faad8b2055e6ecbd6 SHA-256: f41d41407ed0492de5b6013323a39b24bc39bf1330d5cb01c51714170948ec6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/7jicg1ffs034b7e4bm4qprlu00/69320901183.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/cfeb761e3dd052de376a1944cd865c47/49064416148.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aca1240319a---59077365237.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076f5f72eca2---89090677354.pdf
    • http://azizolace.cz/images/file/95488031096.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/694724502ec6bdc54c6a15693777f5d6/22774498276.pdf
    • http://vetranhtuong.info/luutru/files/15242555710.pdf
    • https://b2cexpressdemo.com/userfiles/file/vavaxojus.pdf
    • http://bajcsidavidfoto.com/_user/file/88603962621.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ob55ni15l1qupd7roqcfimdru8/34841779906.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/c98lmn7jitr6haaslq3aa2otk5/70808675272.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea2e474c38---1591316291.pdf
    • http://hphs1958reunion.com/clients/47465/File/pidimuzulogavajebuvavubi.pdf
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/bamixipajirilukenopob.pdf
    • http://cosyromania.com/media/file/35782384624.pdf
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/zufifuzigodejawuzuxi.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/d2f50c07bb5f56eb303a9481b5db5363/ketagugejapevip.pdf
    • http://gocreate.termall.pl/upload/fck/file/vawimetu.pdf
    • http://smiletoursvietnam.com/ckfinder/userfiles/files/xemisewe.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a350a4be4db---xunesazefitobigamiwovafu.pdf
    • http://toeicspeaking.net/_UploadFile/Images/file/18579391973.pdf
    • https://anmimar.com/royal/userfiles/file/jarado.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/i919fj7li77guq28tkp5lfkg7s/40297473365.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090fd916ecbc---dufifanenidakerere.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abe705b38f---73430281453.pdf
    • https://abugfreemind.com/userfiles/file/30474163406.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a972df39e---52799366169.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/7e7cd43emv0kvrri616p7gl2m7/88792164274.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=food+selection+and+preparation+a+laboratory+manual
    • 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_off000108f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108F1 16792 bytes
font_01_sfnt_off00012108.bin
b83de06a4b8e5b047fd415703c679f87ba3c2064948e9d01ffcb2ad19623b584
pdf-font-stream PDF embedded font (sfnt) at offset 0x12108 11004 bytes
font_02_sfnt_off00013a59.bin
708d4c15df01719f4d152c4549d25c00b27196753f4035973deb34e0d7b6a75e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A59 16576 bytes