Malicious PDF — malware analysis report

Static analysis result for SHA-256 4513a9e581f99f37…

MALICIOUS

PDF

86.5 KB Created: 2021-06-29 03:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6722c48ee4e648428a88a3cad3624fda SHA-1: 802dc2c98e408d7baf0016d824ba857ecb4e70c0 SHA-256: 4513a9e581f99f3726ecd0fbe5eb0993882fd4658d4678e65c95a665dfea74fb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous distinct hosts, many of which are associated with compromised WordPress installations or disposable hosting. The embedded URLs suggest an attempt to manipulate search engine results or lead users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://matras-matrasych96.ru/admin/ckfinder/userfiles/files/69326302211.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63fa7d2f7a---77595360161.pdf
    • http://berbun.com/user_img/file/taviwar.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a84c96f076f---95004690442.pdf
    • http://www.ecostroyservis.ru/File/binumemu.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a895b4dfb---53795696715.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4a7bb9f64---bepejigexovalagibax.pdf
    • http://altelaw.com/uploads/image/file/66880051775.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609234d9181de---rajujopo.pdf
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77371426262.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/8b116c985bcf8e5584720afb4a5ba34e/kaziraxipubaxapemijugirig.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c455ba811---ramewopitimav.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a237cb1830---56674691895.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609f817ef2b26---65709272730.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c67c44b5cd0---pobekat.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9992df0b3393878b5e7725c8ea54a2f8/mafipobopojot.pdf
    • http://thepdaitruongphat.com/upload/ck/files/vifaboniduroxaku.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8483634cf---32381702223.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/e56f9189a0d7a3496772464e3a1d405f/81516370051.pdf
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/35990416584.pdf
    • http://pc-driver.ru/userfiles/files/popipulufimepekonowek.pdf
    • https://arab-hams.com/Ups/files/jonagebuxupap.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/964b581955d905652edc9804d0b0cb60/numixejilegos.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/b9f7e2f1a17a195ffe793fc6555a86e9/81176849054.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071c34011963---tarusadivizikufatavul.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/08e37e6cc9b8df1ff8d1c377c5b620a6/36055671705.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f95bd7ceb---pubuxiraxufem.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=wife+lost+sex+drive
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb9.bin
c07d0554b67c6ced41e70e4f60920c1b5dca564b90da7d8ffb7c7ec8d4332454		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 10244 bytes
font_01_sfnt_off000106e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 16792 bytes
font_02_sfnt_off00011efb.bin
2d4eb0cbac6d8667dcd4f9e299f9f4a23e0306f9b2760831df22110f13400273		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFB 17684 bytes

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