Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dfec6d38149d340…

MALICIOUS

PDF

79.9 KB Created: 2021-09-01 00:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9488ce5293843b9bc95124e7f4f878ae SHA-1: 5be103318036e4135ada59a5c51050b8324a963d SHA-256: 6dfec6d38149d3403a492a35cba0516a3e163240d4dcaee6d954a63327d3dcf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous external URLs that point to other PDF files hosted on compromised websites, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/eed1aed88162c7adb3e8523d6c9ddd0f/bazazuserorewugogixera.pdf In PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/sexupobir.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/15692573159.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/407e3ebdf28935c82607c134e54d09c4/55653358500.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/hum7lab21uuut6kd8nclgbrrp7/dumijuduzizumogixux.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/51502095238.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109fb450a694---5953355916.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/d06c7766204831396d7e214c382f750f/97347099271.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085263f5728f---95027917995.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b97214821ee---dagunotovivusojogotomuki.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3ef4d889f---tinukapota.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfcb141aa0---sebixatopabijokoni.pdfIn PDF document text
    • http://learningkey.org/userfiles/pakif.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/dawisemuweneda.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/b73f2f635cc58d641a5671f617dddada/febakavozodusufabo.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e50e06bea---wivenozumepif.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdbe1daefa---puvajefijivexufuwekof.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/0ub8pieatmd3i5k25l20l0mp02/konugameretona.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/4939976459.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/fa157466887a6f9524865aee71302fc1/botixupixuwuzebowota.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/lagibetizokadomuzolawu.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/zowevemonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=english+in+mind+starter+audio+free+downloadPDF 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_off0000d374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8B 10968 bytes
SHA-256: 1a326e381ba1081f786295eaa102ddd648cf0958b9dd93410447c7eca90a8520
font_02_sfnt_off00010495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10495 17572 bytes
SHA-256: dbea160909e2dd7ddb57a12717f218bead9f7a3444e4bd9b7f79752411c08253

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