Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98a96fc9d885c39…

MALICIOUS

PDF

86.3 KB Created: 2021-09-01 07:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd2c333e8576f5cf0caac20c44920fc0 SHA-1: 9444ef955cb814f6d2ecb84ec6bff379ffb15864 SHA-256: f98a96fc9d885c39321563f94421a85f119c860bb7a08a17c83126cd8ead73f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nhachoxebus.com/upload/fck/file/vomivip.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612179f1e254e---51856668052.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ad551039a---37463715249.pdf
    • https://hoangphatdanang.com/uploads/image/files/tokogikadebetixominuz.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/i4pnrsm2ohq7srck0298apoe3j/11551899440.pdf
    • http://daming-school.com/userfiles/file/levagatenesezov.pdf
    • http://lezeckastenakosice.sk/upload/files/lagizajase.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad81ac38d6---wemiwusugulapokuj.pdf
    • https://citrasas.com/ckfinder/userfiles/files/97840621543.pdf
    • http://worshipedia.net/sites/default/files/file/dexizujarajiduvenenigez.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/otp7drc97fabkgc7hvqumdehp0/61806425335.pdf
    • http://roocenter.ru/upload/file/13498978083.pdf
    • http://bagiez.com/userfiles/file/42587507377.pdf
    • http://yangs-ns.com/ckfinder/userfiles/files/20210628172132.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/c3191d522c000fb333cfda53ecee83e5/pubatoliwexaxajox.pdf
    • http://adbuffalony.com/uploads/files/gokemafivepidet.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/e81191ba4495669ffd5b079089170271/lipesiziwenumev.pdf
    • http://thsport.dk/ckfinder/userfiles/files/35558878313.pdf
    • https://oxfordjsr.com/userfiles/file/bugot.pdf
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/wixopowusu.pdf
    • http://jaht.com/userfiles/file/zuroforakevusikifesajexig.pdf
    • https://fotinepmuveszeti.hu/kovagoors/uploads/files/91748565609.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609471f46e509---dibopabebobikunamu.pdf
    • http://ttccid.com/userfiles/file/20870679092.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=the+political+economy+of+globalization
    • 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_off0000e34f.bin
f4cc6bcb5ab88f22820dc7854beb7fc1b4853d2ab91e595f34057d9863719996
pdf-font-stream PDF embedded font (sfnt) at offset 0xE34F 21308 bytes
font_01_sfnt_off0001198c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1198C 16792 bytes
font_02_sfnt_off000131a3.bin
229701c42c38e1d278e693fcd52e621a87151ae79e64a758ac744c01d9ed37c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x131A3 10936 bytes