Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b83d4c1aed17d92…

MALICIOUS

PDF

76.5 KB Created: 2021-09-07 21:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f9e1727f8a48a7ea05c73eb1a27e8b4a SHA-1: 3e82562ad6181b09206e0e18dae967f3317c57b0 SHA-256: 0b83d4c1aed17d92de0bfa6137686917972c6a289628b0fd3b56c41ee9d364b3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and URL patterns are consistent with a phishing lure, aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://nomylo.ru/uplcv?utm_term=n3+choukai+pdf PDF link annotation
    • https://drsubhashawale.com/ckfinder/userfiles/files/94770071946.pdfIn PDF document text
    • https://blokhol.com/upload/files/kanoniputonef.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/15932547321.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/16233260829.pdfIn PDF document text
    • http://kme-kme.cz/files/file/42883946700.pdfIn PDF document text
    • http://master-br.ru/img/file/koxumojasajepalofozufid.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/em0mpcsf85p7ajle185mfaf05s/valemuriruniganuzu.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/pinukokevowufusibejeduk.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/72732087529.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/43716858091.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/87414c2e32392386702384ab846d875f/58782577873.pdfIn PDF document text
    • https://tempatpasang.com/contents//files/76677022413.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/42747973968.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ncjvfc5g37saou4sr6iseam4q2/newuresiduju.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/377ee4289eb30f9ce5a65ec19278d534/60215038612.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/fiwalesizali.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/gerepug.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/f20632b12c86f3a4b5c762978f5e8649/wuvidetazutiwojiluza.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af24f827907---26482696456.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/2190777206b3106d9822b433c5944cec/towimapizapejujefalu.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/kexoza.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16116331a219e4---7822677484.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/muloxurewa.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/kbb5ktbgb1ju1kngohnrg6fls8/87766158132.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/s3l1knub2hv1ului0hg6k896h3/25635092645.pdfIn PDF document text
    • http://ashioke.com/images/library/File/26239865446.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_off0000c1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B9 10412 bytes
SHA-256: 46bca878400a7dcd9a550d67e2a1f62c6e6be936fcab36b5301c183dd9ad2632
font_01_sfnt_off0000d973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF185 19048 bytes
SHA-256: a2ce8f42016b6b676886fe0344c0dd5808f40d30421b7766c8f14d4f3000abd0

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