Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad39cd05b731571d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 14:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6d1a341832ec73c528beeaf1dc6232ce SHA-1: e06aa88ac4c0919fc5766cba24788506071eebb0 SHA-256: ad39cd05b731571d4416fa8789b9b725f4a88bde9deb973c64bff4444c572693
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The `wkhtmltopdf` authoring application and the presence of PDF-specific heuristics further support its nature as a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://huntic.ru/uplcv?utm_term=xbox+games+for+android+download PDF link annotation
    • http://bonfiremadigan.com/uploads/fckeditor/file/wiripuwotigowunojeliwug.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/3595235194.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/70943000469.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3c2ac8e08---wipozodezetazidomozam.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/jilejagikizif.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/keritemilan.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/tuparuzudajeguz.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/damogitowamewukale.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/44228032634.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c45bd02efd577096cbdb51c36af316df/73239519927.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/xoraleweliwezerajewodul.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee34d2c2c6---rewiwexili.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/nogog.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210913_515792520F94A147.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/gibajogozawosava.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16143a14de5910---gexeselisewemomanizogok.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/75164032032.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/54193179666.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/wawamugugiwejiwesupa.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/44912603856.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/d2lak8s7gdplmul8vgatp3udn6/rofenofujokit.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/gufufipodekuvuwix.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff7db5394e---79538127279.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_off0000d646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD646 17428 bytes
SHA-256: 4edc5638a04f4566442d829b54d5b6a28fc8944312bba89dc6f2e385252f16ba
font_01_sfnt_off000103a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A9 10936 bytes
SHA-256: 013cd70ff1f3e3023135f75b0ac9764cffe732dfbc1260f61e80624c609d777a
font_02_sfnt_off00011cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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