Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4136b93e75856a…

MALICIOUS

PDF

93.3 KB Created: 2021-09-23 21:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f01d73fe75d2ee325045ee5dc2c2d971 SHA-1: 5f0e3077f191c991523c20b05486caf62a977409 SHA-256: bb4136b93e75856a7be1818e7e6bf66c80cb256e0be2dc9a2eb39da02b226c5b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL patterns suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inwebjor.ru/uplcv?utm_term=computational+fluid+mechanics+and+heat+transfer PDF link annotation
    • http://location-appartement-venise.com/italie_documents/files/85085239241.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614309de9b770---kivitejomabifip.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/73312800333.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/97311806109.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/44240592715.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/jiwutog.pdfIn PDF document text
    • http://kmsenior.org/file/files/wiwulamoziwejamaxali.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/sokawinowulorakine.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210918040124.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/wuvizexoritamizu.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/74292142641.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/28417196239.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/safivigoj.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/dawogolikixobitamumoke.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/lojove.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ecc72dcbb---10645532989.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/32355978659.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/86476638349.pdfIn PDF document text
    • http://fitviewer.com/files/file/dagubena.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/figeka.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/7qthi8egbtoeda030fsu9918p1/pamasekokak.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f112922aa---fezufopazejobokalurogaf.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/pigemof.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/5712992794.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_off0001070c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070C 17972 bytes
SHA-256: 2f6b97f82e9fd9bc23bb5cb3b0fbb5351a0ea8649d20f5b032d365f8604c3fc2
font_01_sfnt_off00013574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13574 11016 bytes
SHA-256: 77435531cbc9b83924c072477f30561726a3bfa48fea39531d77463a2dc8ff2f
font_02_sfnt_off00014ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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