Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c9a066ddc63f82…

MALICIOUS

PDF

89.8 KB Created: 2021-06-28 03:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7f52d0335e008ee06d4b75f0e0468ad6 SHA-1: 8ff452e299adcd447b73ae0d558905a1d80ebbfd SHA-256: a6c9a066ddc63f825607ec33ae300d333be4c2d2bb367888110b6bb6e4fdb28f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories, suggesting it's used for SEO manipulation or to host phishing content. The presence of multiple distinct hosts and the use of disposable hosting further support this assessment.

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 https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/33757f36cf05201f1de0a174a0f41226/82986927380.pdf In PDF document text
    • http://x04ydivan.ru/userfiles/file/keravike.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/69b34fb4f6c94c71c94094a804b05896/gemelifiti.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/7019873198.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/51212723986.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/dkijvhhfp0vhq552n5tk0s390e/40090614581.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/boluwuzoduxusun.pdfIn PDF document text
    • http://chromoink.com/updates/file/59605057929.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/momepom.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/wokunobujeje.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160946654b9c14---72486779208.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/dic8rbv0dn79n0donmjot2oq93/66394426356.pdfIn PDF document text
    • http://inglewood1968.com/clients/68690/File/33279941475.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/33093044274.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/13238159282.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/kibixeze.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/46137432555.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/2413348410.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/93053703839.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/17143912335.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/vrcpje5qhht2n2ibloae89uqt0/82721739210.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/0fd0896bfff6fb5c354b85420d2777d2/suxabetiwabofenerewaru.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/kaxumawojumojabijaw.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad2c6244d---94914044070.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f197346395---rajomidavuser.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/vudefutaritijagusap.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20216248321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=early+childhood+development+stagesPDF link annotation
    • 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_off0000fc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC48 16888 bytes
SHA-256: fe0b9dcf96af3557c5f9ed4e53b6fd1c1194dc42bfc8ecd9cd0fe34eeae4ceb2
font_01_sfnt_off0001280d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14024 11124 bytes
SHA-256: 4205be786b312e1eecc244b7ae4fab4c3383bdabbe1358c5e3d983ee8c844ebb

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