Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c5e6fc2c7a5d89…

MALICIOUS

PDF

89.2 KB Created: 2021-06-28 01:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e4e92f89c561762e08a17a1bf1ea416e SHA-1: 3de65eea915d2041af8dabe65a49ceddb4d06431 SHA-256: c2c5e6fc2c7a5d89d369149534fd03a59fcab57e5ffa674c11ab383fd895da52
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload storage and disposable hosting, likely to distribute further malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit vulnerabilities or lure users to malicious sites.

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 http://przychodnia-felinskiego.pl/uploads/editor/file/dexejuzima.pdf In PDF document text
    • http://msinziniering.com/userfiles/file/48236969669.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/0b4313df0917915a23a4597d08a70d2b/82133321113.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f904f5148cd3661d8c867d1a8f47b128/28318909632.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7e7d5f1b9---58398929997.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/0c7a5212c241e9bd60cd87bc3d4106c0/44482520440.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/rapenafajajav.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/3ba6a366a09c6aca806865577d0750b8/wazuzujomamowukob.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/f2df54a9813904d90bb84c428c74e6ec/76666969363.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/31760062238.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/nalobamusudafojerimul.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/ruliseludisuz.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/15023d53adb4316766b214a5911fd6db/latolekirat.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16078fb296bde6---69475319596.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/8fe47f45500f30db84085a2050e9550c/85434171859.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609415f63554a---nelalejemele.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/10030850751.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/tazupeli.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/96571841841.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/47e56ec7818380f1f09c37b7f5156384/felevixew.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/polenoruwelimofapiliwalu.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/b79c9902f933bf43b7b55500705070d0/65086345954.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/u1viat1tf31q33s3r4q37fd4r0/55505086578.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/kisipaditisivezasowefi.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/73668942530.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f784275db1---gifugavoxefojitukijivet.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/zapinipuwekit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=apa+format+for+organization+website+with+no+authorPDF 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_off0000f960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF960 16808 bytes
SHA-256: ee5f7964938d242792af10cae7e16e414f6e782e8e982c9e4f2d194545717d76
font_01_sfnt_off00012551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12551 11128 bytes
SHA-256: b4a8872d8144e660c4a0ac6432d148ab76d12003b7d3cceb1f33bc356c195aa2
font_02_sfnt_off00013f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1