Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3799ab09e404fd…

MALICIOUS

PDF

86.9 KB Created: 2021-09-13 19:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5bfa842f8f0143a1e94586d178b0acd7 SHA-1: 16d907aba1d0d86129fa59a294985a5440257243 SHA-256: db3799ab09e404fdd9db2ca58c4d4e3073b24c084eb579eb27e68e15eee49b6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate effort to create a network of links for potentially malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://ketchas.ru/uplcv?utm_term=solid+explorer+android PDF link annotation
    • http://mitroc.com/userfiles/file/butodugukarilodoxakasa.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/75874129686.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/fijulixixomefat.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/bofulujiwijeta.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/90954117301.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/nifebijusuvesodefopidaw.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/85289702739.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/visivomozexoko.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/70378591536.pdfIn PDF document text
    • https://5uempat.com/contents/files/17896263222.pdfIn PDF document text
    • http://ahknchem.com/upload/files/divudevuvuw.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/89449239710.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/wakerumelifirude.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/puguxoridivofejudorewajan.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210902_ABF0A4A94E6AC593.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ffddo5hbn0ascpmct32dikbe3j/wekeguvaxomuximet.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/fizegal.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/serapepokovapeneleviv.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/xafabefolirafosojo.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/aa351c90385bb4f908dbfba71d0e1df0/wibizuxus.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/rozagapebowibifaf.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/94468232683.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/75596978718.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0372abc04---demifuzeterabenuzis.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/64609246252.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_off0000dc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43E 22712 bytes
SHA-256: 5b7763cefdc139d41f4bb2f1c09250cc3357a24b3f4784d19c68dc926ae4f93d
font_02_sfnt_off00012de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE7 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off000135e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E4 10296 bytes
SHA-256: ec31377997978a48d77ab89a9f90faa52c36351fdb2e65c0659abe27a433e352

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