Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ea25990a7633f4…

MALICIOUS

PDF

88.0 KB Created: 2021-07-29 16:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8138087dc966df4180617f7ba3ce4e0a SHA-1: ca6c2f99e3641910dc6fa1d56de26c664cec999e SHA-256: 34ea25990a7633f4578d6c0f18fe33ef602129d65428d070a5a20db336beb3c6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised CMS upload storage locations and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the presence of numerous external URIs and the heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://angkoronetour.com/userfiles/file/ruxemilasigipofeb.pdf In PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/6243f41baf9a496165bd3e9509fd69bc/44937767860.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/55407913342.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/7e321d5e7a0b613fdb959921efb0e1a1/37621336057.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/xarivev.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wosapiwabujaxoxasofugeko.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/5085459688.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/8dbcf2d0b98e6963df04b081523e0fad/33493365179.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b470bf316eb---kibetizi.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/46f4811a04288a2bcad019d425eaca0a/tevudaridurorojutezezupof.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/7ce7eef09beb1b3bc3c488336a12783a/sewujesin.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/49831803679.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160777ca13a35b---93083001321.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/98649967800.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/jobanofulisililivoj.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/bumuvapagesumolaz.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a09e415d2e---tajadibogamojijerunaga.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e195bbb61c6---58189834467.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/21971933729.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e005ecb6476---36385322168.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dd5fe030595---wetabakufaturol.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/kegirujedabigakobip.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/2628485230.pdfIn PDF document text
    • http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/60645055377.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///gijikulerodu.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/varafatizodubebokatizor.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/f4cc2e9e3a41044c036c3f2218679f97/magaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=sandi+kruise+test+answersPDF 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_off0000f264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF264 10428 bytes
SHA-256: 7541520df2228148f9b7021e526c8fae58aaea76329cf474093bfe8f2035329f
font_01_sfnt_off00010a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12249 18160 bytes
SHA-256: 6981513c739bc3f91944ac9c48f971f0b9c0d8257facab1b9e57864018cc6316

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