Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d64652c5f3b299…

MALICIOUS

PDF

95.3 KB Created: 2021-08-09 02:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17e5d3bd286fa3f5bbfc246cfad8cc3d SHA-1: 74220485379706ef846f21603bcb8512445a0d60 SHA-256: 83d64652c5f3b299fdae15d48333f206c8ab690c0aaadf11faac07735b331bf6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised CMS upload storage, suggesting a phishing or redirection scheme. The presence of external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM rule further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b24a69343---99082215927.pdf
    • http://novelinternationalschool.com/ckfinder/userfiles/files/vukuromatabofurike.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d962c5e4a7---93606253576.pdf
    • http://bosch-service-center.ru/uploads/files/65187739869.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160985fa8f3d52---12789967004.pdf
    • http://www.findvoters.com/userfiles/file/fonozotifiwudij.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c89f1681a61---64872591310.pdf
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/zuvakelafadupezej.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f27c3da402---laxasuwikejamez.pdf
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/85817847870.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed1957e79e---jexepukinosonizap.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/79394b8310e3854a8ec787107e0a8430/sonazikibamalobipotajerur.pdf
    • https://biserica-izvorul-tamaduirii.ro/files/fojatipejepotojetu.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/gcd3o3qcbokhh2in3aivfttb85/71010788467.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076248e1e4aa---bizijaxerigaxudiredi.pdf
    • http://qianlong99.org/ckfinder/userfiles/files/94630983421.pdf
    • https://motelandratecuci.ro/userfiles/file/lugamimenedit.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081a286adba9---25110217273.pdf
    • https://plentis.eu/ckfinder/userfiles/files/4519141929.pdf
    • https://aawyx.com/sites/default/imageuser/file/motinonikipafogerosaz.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a134accee01---30566523156.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160820e230f88d---88324793416.pdf
    • http://medi-sen.com/files/files/6701891749.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=android+on+touch+listener+not+working
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808a55cf125---13292536869.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_off000100e8.bin
707ba978753890298c46f707f61e0ff6e7a41269b337b3dd945a693a20672eb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100E8 24348 bytes
font_01_sfnt_off00013e8b.bin
6a14f9e4567b385c7e470443ae7db06e8a6c47ca0874171d6f83eabe5f8dd6f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8B 10748 bytes
font_02_sfnt_off00015713.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15713 16792 bytes

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