Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef646de23729971a…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 12:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2ded76f70878c9a786f8ce2b0f1f6c4c SHA-1: d900001ded08ee959f7f8ab97fed0d46f752e6ab SHA-256: ef646de23729971a2e5fdeeb89a002a5bd1815db96363d54b9ce6c3cef21a8c9
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Numerous external URIs were extracted, many pointing to compromised WordPress sites hosting PDF files, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=phytec+yocto+manual PDF link annotation
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608476a083ceb---laposuzojakozusamidolutob.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/golujofivopeduduj.pdfIn PDF document text
    • https://baongochoa.com/upload/file/30515345012.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/39238526073.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16100ffd4526f8---96005926908.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081515476d10---84847904682.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/darumirumeguleme.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/nejiwoxipezemawelod.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e07ab59d5---98473343918.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/86353365724.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ma43fp1colfobjaan56l8dpce1/42717479869.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/93240577150.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/mawefidigejikubazevadeg.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/af0c44f1260bcd00b59561bcae04007a/42311847558.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/1191ce80cc3aab29f28bec5e0c752dcd/kawunobegu.pdfIn PDF document text
    • https://abeess.com/userfiles/file/rupiwamaliporeredunuje.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/75995186545.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff26f64387e---nagarumok.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/34cda3fe098ee3958b6259c8642b4fba/lipefefurepagimugelipelo.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/hoh4jev1ma6kqp449n96duqv1h/kisixid.pdfIn PDF document text
    • http://orhs86reunion.com/clients/6/67/6744625166a0df26c7abb40948833271/File/dobugofo.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9202911b04---79628876739.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/67746347261.pdfIn PDF document text
    • https://lesura.net/userfiles/file/13121768938.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/3486e63804312df87ed20a6046ef26c2/nuduziliteduvumugobotibug.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 10352 bytes
SHA-256: 4327298a82526aac6da0c4ce183f84c87c20128c4805c03a8595c1b2acbac064
font_02_sfnt_off00010941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10941 17780 bytes
SHA-256: 530d2379edb0bc31a46878ce561c22c2c29922e4b9d85511939ef74969c4128a

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