Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3086d70a94cfed…

MALICIOUS

PDF

86.4 KB Created: 2021-08-08 12:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b608df7aaa72ca90be6035c7e1d25e19 SHA-1: 173ffd0828cc0dd065ea6adf3fb84b30f5f888fe SHA-256: cf3086d70a94cfedf3eea4ef7f9a26793b198d0013603ceecf937559b3dfe58e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL analysis point to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bebfc457c86---gojogotajefowoj.pdf In PDF document text
    • http://www.drivingschool-brno.cz/files/files/rokesijawimawa.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/23840743512.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/c6a152c63576f2f35ce136c2cfdc9e11/liwenegemeti.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e192761075---40788395843.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/85541964100.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/8323773573.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fdfd028ddbb---fatadaxidevu.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b95cda322---lumokupoxujetexu.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ccf1debfee2859320fef1cb0da1a7a88/xemesubumajadamurakoja.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/rovosumudu.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/b3ed870747b9a683f3aec8ea367e1d6e/79011458764.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/585064c1aaf6d9e6c5cedb9360250ae8/xifomevuwokopizipivivop.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/nofanef.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/80631865389.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/19960373e08a172fc71c407640afcc66/jomabasi.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/mg6bomegdopiaefl97tickb2ji/61272646399.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/6eeadd91d0ba6292a9c6a1577644c2f9/51481874389.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/vukoju.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/80658846958.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/piriwesilesupebak.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/rs1hrpanav0ldb5e11pg7b9jbk/28783122192.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/44224067258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=palabras+de+mi+mas+sentido+pesame+a+un+amigoPDF 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_off0000ebf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF5 17492 bytes
SHA-256: 29c789e812182232f71bbbf684a9a3cc7e6829c04bc3fbe90588d00d19524de9
font_01_sfnt_off000117d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D2 10976 bytes
SHA-256: bc255efa97e3c8b96fc93ad9b36abd4440f9821538bfd42f5d4d179e67b6b607
font_02_sfnt_off000130d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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