Malicious PDF — malware analysis report

Static analysis result for SHA-256 dffe39fb2f10bc9d…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 09:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9c235cf04c4f8a8fa6a495e6350df57a SHA-1: ddc9fca4fe2cdc19b7db32026c74ebcc97366c32 SHA-256: dffe39fb2f10bc9d17b7f837f072b900e6a16041dc325f453e578d4da93f8693
176 Risk Score

Malware Insights

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

The PDF exhibits characteristics of a phishing lure, including an image-only presentation and embedded links. Heuristics indicate it's a link farm pointing to potentially compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ratodua.com/contents/files/bapedi.pdf In PDF document text
    • http://parateam.cz/file/26535888992.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/76263127623.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/133fede5797a9ebc37dc2eb26c7d1703/85812473346.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/gumew.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/75343148201.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/wokib.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/basurupi.pdfIn PDF document text
    • https://afma.pt/site/upload/file/13992970808.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/c75ce7c2a121bfd0c6481997041d29b6/81254501668.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/fupisiva.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/darowem.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d592fda239---31762071810.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/69959505822.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/pojefomurepevepukalav.pdfIn PDF document text
    • https://nocrime.cntwn.org/ckfinder/userfiles/files/70323431767.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147bad486227---32073102778.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/kufunup.pdfIn PDF document text
    • http://reichspfarrer.sk/file/40839338973.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd62f3c178---kovidululusawop.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b841b28710---89529603130.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/8184434598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=hattrick+organizer+app+androidPDF 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_off0000b03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03C 14120 bytes
SHA-256: fcae52a01ed256d9f587ce15d8749761773525e063cc513acb725ea71b0da860
font_01_sfnt_off0000d373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD373 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8A 10620 bytes
SHA-256: f7bfeb9a5d1ab6c2191041de27400ca121d0b894d0dfac47800b7ace6b70e865

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