Malicious PDF — malware analysis report

Static analysis result for SHA-256 31da26bdb94d8a8e…

MALICIOUS

PDF

88.0 KB Created: 2021-08-18 14:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 218e2e2baff5ed98b538982e71351bb2 SHA-1: 6ecd5e2fb6dc1c20137b2b87cc961d7b520f3459 SHA-256: 31da26bdb94d8a8e6a1859ce6af72f5174fddddfff68e3e27540472038eb006e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9795

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://coretry.ru/uplcv?utm_term=download+ps4+emulator+latest+apk+html PDF link annotation
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/02979f0ec62b579c62189aeb318c5619/bakikarokij.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/17187894222.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e007428e6---13364014624.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/0acc9d60bac2ba002b32350d94de147a/2740843682.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/kedazezizutexafab.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088b8be2f026---wasipajozirodabasutuvofa.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e0b21ea20---ravitufedutotip.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d852ef715---zowasuwup.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/rurojorejowez.pdfIn PDF document text
    • https://avela.md/userfiles/file/tivufuveburen.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2b09a07fcaad2f0d42969e194bec6b86/40238960856.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abffd904077---87289021242.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df07536063---pojifu.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16215127647201.pdfIn PDF document text
    • https://bojovicsirogojno.com//files/52746735757.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210701_DE77C15CCD8BFC14.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/16223828302.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/74922960059.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/naziwuz.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/forovidanokezubejilemosu.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/5602hpjdtiuh6fuv8b2vd84rj5/24078768164.pdfIn PDF document text
    • https://mauspro.net/upload/files/30132211364.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16110c08e52f86---fekozulisalo.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/moraroja.pdfIn PDF document text
    • https://onwater.my/uploads/file/88414049745.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b1a7a46f4---36041239175.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/10721177334.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A5 10920 bytes
SHA-256: ece85b2dd42b1a77a9fe49b6dc5adfa578678fc05e74d937b7bdc40d719f0727
font_01_sfnt_off0000ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 18136 bytes
SHA-256: a7d3b1e0ca63f46ed9aa373b9e8fbdc1f3f9eb11e03e43d8aca57f993d8e9849
font_02_sfnt_off00012df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000145fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145FE 2624 bytes
SHA-256: c409176a4b20a085d755e529960efa84f0ceec817b715aabdc742055c8eb42d3

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