Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c82a9a453567631…

MALICIOUS

PDF

96.6 KB Created: 2021-09-06 13:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dc1603dfa9498e535a3c0212807989b2 SHA-1: f202c539ec332bfd100464d67b7e8361b4202a52 SHA-256: 8c82a9a4535676311715fec6f571d82c019e439158e04e4040d5195cd59adca1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external URIs and links to potentially compromised websites, suggesting it is part of a phishing campaign or a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of external links indicates an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://garglob.ru/uplcv?utm_term=the+imperfect+tense+regular+verbs+worksheet+answers PDF link annotation
    • http://snailgame.ru/upload/files/20210729235417.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cf928f82a---23156788584.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/llttvtohiqd6fdf7mb4gk4aotg/siwilumivisi.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/76341438236.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/3q2tv3707vonr00oe7gr8in2e2/miteseximuzelurujavugof.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/386ba62e5b63077f2bbfb1a765c0ad0f/20442161996.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/5f8e8b28111e4918ca4ce92af250e671/54189722554.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/38957067575.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/87770133116.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/65754132605.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/43563055400.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/cbdc6b9a8bdaccdf093f3ae438a52aab/negefuwewovutuji.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/52456542315.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/takazenajamipukoz.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/78808831748.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/nuwixegokufikozusanewuni.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/korajaberasetuwazakaxiri.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/votaretodu.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/d48572ceac91a9e8a0968677d27e8350/kelezaworamuxoxejajar.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/92521103522.pdfIn PDF document text
    • http://zeci.nl/im/image/guveforubazet.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6fabde0c6---fibulizatidesewunidulu.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/10871339849.pdfIn PDF document text
    • 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_off00011229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3B 18324 bytes
SHA-256: 78bc44014ae121bd0963c629feedc74fbf851f193aef20fe6b4e0eb6fbfc5b42
font_02_sfnt_off000159cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159CD 11372 bytes
SHA-256: 18cd18138b3d3937068d0b7a46da9a6da4c43ddbc141c4ac0b5e3b898ffe5127

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