Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9ae4da91b73f39…

MALICIOUS

PDF

83.6 KB Created: 2021-09-22 16:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4d5da622137e6d01179d993a2e65333 SHA-1: 057f50f76872d95ec6d70e9f0f3f6b29df74de75 SHA-256: 5f9ae4da91b73f399b062d243318d474b5c340509270a4610f2e1fa58af1cba0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised websites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://inwebjor.ru/uplcv?utm_term=mini+militia+god+mod+apk+download+denzel+wilson
    • https://fruitssupplier.com/app/webroot/img/files/jonovezotobelukenejadekuv.pdf
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/vafabobubulaladedorawepur.pdf
    • http://aylabawadi.ae/userfiles/file/vidurus.pdf
    • https://vegan-eshop.cz/data/file/fibijipitejezuvamowiv.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f341086cb0---93786574872.pdf
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/47454468896.pdf
    • https://rajatotogroup3.com/contents/files/32034578475.pdf
    • https://sieuthimaytinhcu.vn/upload/files/89863852819.pdf
    • https://unicon-msk.ru/data/files/85615601330.pdf
    • https://manenshop.com/upload/files/12915286497.pdf
    • https://aawyx.com/sites/default/imageuser/file/xufol.pdf
    • http://portalinmobiliario24.com/uploades/fckeditorfile/15200830762.pdf
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/fuvumaka.pdf
    • http://auxerretv.com/content/public/file/fokivo.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/7j6ank735r95897qkr4l2ud2re/65702703893.pdf
    • https://xtremefitksa.com/ckfinder/userfiles/files/letowarakarigaxupunupasuj.pdf
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/wedeto.pdf
    • https://pleasanton.com/wysiwygfiles/file/32744615153.pdf
    • http://brandorbit.in/userfiles/file/nutawevudibafuto.pdf
    • http://colokit.thienlonggroup.com/Images_upload/files/84764150173.pdf
    • http://arsvet.ru/img/upload/pebad.pdf
    • http://universalestetic.com/userfiles/file/valuzakebifot.pdf
    • http://contactfm.be/userfiles/files/giramesar.pdf
    • http://brlairport.com/images/file/dofedodavipupalav.pdf
    • http://dtyxbpzx.com/filespath/files/20210904055908.pdf
    • http://heatexchangersolution.com/upload_fck/file/2021-9-7/20210907160322885675.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4e8ed74a1---9945611835.pdf
    • https://mimpishio.com/contents/files/22141319633.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_off0000dcd9.bin
e9f8e7cdeae5788fcb67be77dc9ce576545c12aa2bc9ea2901763d2cdcc61116
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD9 10868 bytes
font_01_sfnt_off0000f5cf.bin
b738eeec41fb27d1719e4c0964244ff059abfca8142a87d322b45506fea7243c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CF 19272 bytes
font_02_sfnt_off0001279f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1279F 16792 bytes