Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc996ff81150b44…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 04:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0d9010c2c7f5f8847fd72f922bc58c1b SHA-1: 6897340cf439a4c8046663ffbce5566577b91d8c SHA-256: 4cc996ff81150b4479b4fddd84177ea18bd3a73a6a86bcee3082922f8bf3a882
204 Risk Score

Malware Insights

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

The PDF document contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing software, a common method for malware delivery. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nanumed.ro/uploads/files/diwewixexese.pdf In PDF document text
    • http://tamker.hu/userfiles/file/2158723102.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/dotuno.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/lonasigebefiva.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/gutegowuwuranef.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/gagufifumemigurosipuni.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/mefijokadasuve.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/toxomaruzaxelide.pdfIn PDF document text
    • http://mc-opony.pl/files/file/31572459678.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/70483662152.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109151937245480.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/tixugaw.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/42520631229.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/1a0bca2cdfb379b1830c5e38d555f9a4/13652801844.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/19849748360.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/guzuxopefiduratikisod.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/65061099e4ee7b4c618f1297f407efc2/19592163939.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/dovubut.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ep7017d4ks5bgprtodielbr366/bezoxigomunikilonusez.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b0bcd58c---77668281910.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/jononudekojiwabakumodinu.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/rumerutanudipuriwawow.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/nemofalol.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/26219627406.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/kolumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=firefox+dark+theme+androidPDF 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_off0000dd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 17496 bytes
SHA-256: e368847f6176434805e28fa94b13a3b49175e626eb715713c99394c65ebd4c37
font_02_sfnt_off000122d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D8 10576 bytes
SHA-256: 301a51f03fb790a85d0e53568d059a7f32d037058f866b600b143924391cdb93

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