Malicious PDF — malware analysis report

Static analysis result for SHA-256 7809714b6c2eb248…

MALICIOUS

PDF

91.7 KB Created: 2021-07-05 15:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 498d01d49582f1fa0b8881e6f57178ec SHA-1: 11a4bffc39c3ff1775d5cccaa90214feab6f1b5e SHA-256: 7809714b6c2eb248d97395686d50010a051932f22775d2b9cd99292696b5d80b
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be directing users to external, potentially malicious, content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c205825a5aa---34414699727.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/e830646c156b716bd536fa219d15b132/42469000739.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/68bd7a0bc231cd281f23ab6819d1f689/48170028947.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a14b0bbd4ca6ecaecf4003a628fe67fb/xosodudokimodudebekepajus.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa365adae9d---17603753604.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/4o5l1vgp7vubceoa8a63bq2ma0/tavodopolofosowus.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1257483da---47607353174.pdf
    • http://bannermaul.com/userData/board/file/83624647336.pdf
    • https://ce-mi.pl/uploads/userfiles/files/punijefana.pdf
    • http://dienmattroigiasi.com/uploads/files/jigalodatotatojemuwej.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608854153a549---domevabetidudizeleveda.pdf
    • http://cablexconsulting.com/Upload/file/45990626197.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de255af08a---fugeful.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/276osfdlb830e264tnqj5tvghu/41053705043.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087882be8891---xegogire.pdf
    • http://morard-mcf.fr/data/Files/gutikuzinugodapomaxu.pdf
    • https://eurouniversal.eu/ckfinder/userfiles/files/siwesodaroxozune.pdf
    • http://reneenicoleevents.com/clients/865995/File/81853169649.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160732dcd24b19---xoxokedijidunisonugowux.pdf
    • http://kapli74.ru/upload_picture/fitimoto.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/g7fjt7c1lqpvdn9fjl3cnh7ljj/85998760508.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d3a40b50a---kesodig.pdf
    • http://1-cx.com/ckfinder/userfiles/files/16081229812.pdf
    • https://zlato-eu.cz/upload/files/11908991816.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d86fbca4c---55331125183.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/8oi0siebt6vqp2f2ccn7g18pd1/waravexubivisuke.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+touchwiz+home
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaac.bin
91d52cac3215945c6db3444531fa87c2570877130d06b1d20b9098cd1e106025		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAC 17404 bytes
font_01_sfnt_off000104c4.bin
d5a41f9b968feeb5bedcfed1fcdc8769cd415ed96d690992aae96ac7b99cc5fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104C4 16960 bytes
font_02_sfnt_off00013121.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13121 16792 bytes
font_03_sfnt_off00014938.bin
839252c6e060b72ba4f8cae83a3288c70640bb8f734d51c466a5ad0998ec5792		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14938 10484 bytes

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