Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a3bdb1cfc4d9a2…

MALICIOUS

PDF

94.2 KB Created: 2021-06-30 05:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 26a71dd93b6056343bdcebf2f64617bc SHA-1: 3b06aed1c7b262348f63a529983dbfdf51538328 SHA-256: 35a3bdb1cfc4d9a26e8b2bb9c7a3bc1697f7b1aa06fdc6be445ae65b43a29ceb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure victims. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://pioneerlift.com/upfiles/editor/files/89518713628.pdf In PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/fc6fbmdksr88c0jfhclpnjb7nf/26315924719.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/bilimigigeb.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3d1fa50a4---devazijoxolimo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873868e7369---10213822364.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/875abf0581b2890c288f6496d9788ebe/dopuwisowazavavejuzeku.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/ranotozosadoniv.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b744c602542---lupijajafimamutap.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b70b11ea0e---gejij.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a3f032e85---21921162471.pdfIn PDF document text
    • http://sun-eko.eu/files/file/bixufenemeku.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/tazofilepini.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/a9a8488380d167b87d651a0c4a72b881/54975936980.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/17552765377.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/56d1031e2dc069767229bc74cbcd1ebe/mesuwe.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/fsmqkqt4jsanq82i73e0uqdgi6/70271299191.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/jefomegutirojibagelub.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f42a1afb9---pupubu.pdfIn PDF document text
    • http://orhs86reunion.com/clients/6/67/6744625166a0df26c7abb40948833271/File/dafukukanexakekudokovodot.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/9qcq8sc5a3tu2a7gu95hq64vq3/65753413349.pdfIn PDF document text
    • https://mmszke.hu/files/file/74459595652.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/ru7c2fkthe3hs80an6imnlu3ek/jaxosixegulapi.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160816dbfe6120---34235713510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=american+english+file+third+edition+pdf+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000141a0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x141A0 21932 bytes
SHA-256: 9d04b299a16e99ac9906fdcf4d8906a4ae16aa4db40635babee546d4307ae9bc
font_00_sfnt_off0000d8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 22176 bytes
SHA-256: ce6d33fece7c221d73a2ae9e1dda8e2136d150b46b8663720021e4f56dd77183
font_02_sfnt_off000127fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FC 11136 bytes
SHA-256: af4dd8f2d4d62896bdb18a0afa54149c389491eb8e6ecdce6bc3de47b1573dee

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