Malicious PDF — malware analysis report

Static analysis result for SHA-256 1afc086a8f083b26…

MALICIOUS

PDF

93.2 KB Created: 2021-07-21 04:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0b8a453b9f624535517dbf67897e501e SHA-1: e20e00c2cac0913f473559d4bda1a9ce5fc336c0 SHA-256: 1afc086a8f083b26ced691be878bac746da720cc3b2cc19d7fbab8d2d3d488d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan. It contains numerous links to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and link farms indicates a phishing or scamming attempt, likely to trick users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/1tr11uuau9h4dp8b2m5hpnlpf0/wetipeledawugota.pdf In PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087014e753c4---vufefemelojovupabifime.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/49edc654111bed6c57b32331402f8516/276210630.pdfIn PDF document text
    • https://csn-alliance.com/data/files/vupimimajewozekegu.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/b9b9962d408c7877f700cc743572563f/zidobizajazu.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/toxojuxopo.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/vediladojodazemuko.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/78583264255.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/b8e17006ed6f3470cdf781c55f62b530/39763521525.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/4ako7bhcfn3ik376psoiq5lo77/79928446517.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073860d9a4fa---25595266321.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/khank1h1c3eklcsn9q7k8kf842/jeledikabibub.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/7fab8ce01bac1bcb31761e3a10b91864/fodisezuzaredo.pdfIn PDF document text
    • http://faradbox.pl/files/file/88053192082.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160808bcf54802---wesodekepapasagobab.pdfIn PDF document text
    • http://newtrierreunion1962.com/clients/6/64/64567561842b0bbd40b956adda0282a7/File/91103120428.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/34774961611.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/gerorijulamek.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/sumiwuxubefufujivale.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/56208881030.pdfIn PDF document text
    • http://elm3rad.comfile/wesetudo.pdfIn PDF document text
    • http://innotack.com/userfiles/files/roxokaw.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/29237160167.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/wabomidupurukitamofeje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=best+gas+companyPDF 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_off000109cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E1 17436 bytes
SHA-256: f308dea57d4b13cb713205b5fe382bb415d3f7216ae4f0f0ab3da54b0c9d1a57
font_02_sfnt_off00014f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F88 10648 bytes
SHA-256: 2ccb12151d7378768f3d625dea32fd20467e72b06920a45f9535fd6f11c83ebe