Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6983358d1884f95…

MALICIOUS

PDF

74.8 KB Created: 2021-09-26 21:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6fd0ef496de06954852ce59c1f4fd87 SHA-1: 8be86351c6b97f4854d2fa4b6fce962d9d1f0932 SHA-256: a6983358d1884f95e27c3f5667dab0ec841a51cf99600a8388e02881c458c8b6
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 critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file functions as a link farm, directing users to numerous external websites, some of which are hosted on compromised WordPress installations. These links are likely intended to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=aquaman+1+streaming+vf
    • https://walkandsmile.com/userfiles/file/55035612390.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6cd255e5f---pedumolutusubeturodif.pdf
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/todafu.pdf
    • http://tourhong.com/FileData/ckfinder/files/20210927_CE72C0917457884C.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613574ac5c058---95914000562.pdf
    • http://dietaltop.com/userfiles/files/67355172446.pdf
    • http://telegid.tv/userfiles/file/51619312507.pdf
    • https://yellowstonewildlife.com/1943833357.pdf
    • http://live-net.it/file/57787301631.pdf
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/dokosuluwa.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a10c493725---56373129493.pdf
    • http://marjoleintje.nl/include/userfiles/75038773012.pdf
    • https://sadhankendra.org/erc/media/litemorege.pdf
    • https://svingenieria.cl/userfiles/file/83923477313.pdf
    • https://livre-art.com/ckfinder/userfiles/files/ruvarowuxud.pdf
    • http://artattack-concerts.de/files/file/kijurivikiwanamovu.pdf
    • https://milsagliksen.org/upload/ckfinder/files/82441850910.pdf
    • http://rnralpha.cz/res/file/3668299124.pdf
    • https://techson-cctv.com/upload/file/giwipe.pdf
    • http://mixline.ru/img/lib/file/zomuxakafataxonetavazu.pdf
    • http://inggeo.eu/userfiles/files/29184288020.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161315a98887e7---kaxopasi.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ddac47387---zamowanugibupop.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139df6554bfb---59379147509.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614edaa62ae60---72396722242.pdf
    • 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_off0000b946.bin
31407112b236458e9dc1e694c6b0866679732c7d3deae86cfb792d9872e579c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xB946 19348 bytes
font_01_sfnt_off0000ebd0.bin
18f988e6376cec174be761c8c70458a7b86291c540c7f057508007515a370052
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD0 10736 bytes
font_02_sfnt_off00010442.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10442 16792 bytes