Malicious PDF — malware analysis report

Static analysis result for SHA-256 3840cbb26f3f59cf…

MALICIOUS

PDF

72.9 KB Created: 2021-09-18 07:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65da245d4257bacf8dbe070f92b5a3ed SHA-1: d3b054a1b1631be63576348786f8ba58120bae91 SHA-256: 3840cbb26f3f59cfd970fd3bfe6b10a8c71f4b9ecdd4f78cb7407e67be81c7ca
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document contains numerous embedded URLs pointing to various domains, many of which appear to be link farms hosted on potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nomylo.ru/uplcv?utm_term=android+asynctaskloader+example PDF link annotation
    • http://wakesup.org/userfiles/file/3748018883.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/86310153848.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321946831f0---82919168186.pdfIn PDF document text
    • https://onlinendttraining.com/files/visono.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/zagusububux.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/62098651214.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/rukoxevak.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/kimukanibotumugibedomod.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/zotejirusexizirukomij.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134c7e7c19e5---kugatafiporawezejibejogal.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/17904856971.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/woxepukuw.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/mifege.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/rupowajovez.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/47276156610.pdfIn PDF document text
    • http://maidichike.com/upload/files/36296332956.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/b4480cdaae40cb0105eacbc9c0fdff2a/lodanatizipezuzebesu.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/44817826081.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/9892456832.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/65104276929.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/mulikizokased.pdfIn PDF document text
    • https://pindimana.in/uploads/file/letipodivov.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/tewesobasij.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_off0000b925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB925 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD137 16724 bytes
SHA-256: 1af1b50ffbe523b5946274d1e4a628178910be7d35f8cda444b7d2276ac113e8
font_02_sfnt_off0000fd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD13 10964 bytes
SHA-256: 49db28d3f352888c384d067368019372d1ad367d82e48a0323ec5f393bd63d63

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