Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d831683518f7a6…

MALICIOUS

PDF

82.1 KB Created: 2021-09-02 23:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 790df7003c89a0e074ba4df8ac71498a SHA-1: 0d973abcef413bc2417bdf6e4fd56a186e93aff8 SHA-256: a9d831683518f7a644c9f6c96733df2b83a24e4b85ae62da2ae62412c811b12a
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing or trojan variant. The document's structure and embedded links suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

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://burgas-remonti.com/userfiles/file/rexawibenamiz.pdf In PDF document text
    • http://birzebbugastpetersfc.com/files/file/88452199793.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/tenokipedibimisijor.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/7qc80hirkk6malavk88a2atkhk/lixejotube.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/xuwuzopinunowuvobezufubir.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/duzovulasavuziputa.pdfIn PDF document text
    • http://linker-apps.com/files/xitogurekonepom.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/cbc8b6f3369e67b7ea56440bb048e0be/vitugopa.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/848026373.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/n6ndhtt4bjli96mmsapqc78f4m/60770407125.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/82865945440.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2aeb61e63---todagitonulusubusinubof.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/lowarexamisifaseduzorada.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/7njrf3ug3dp8ub6qpq4ltl5f6t/kizovodem.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/9tde14liifrpc4taa8846mfpo1/70534291993.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/5d3778659f0b008f70828c06374609ee/60096437562.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16087b52fd9410---1592829319.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/9883043532.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021072321344173499.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/vlnnu8b0r59587no4j7ccirkh0/29585304918.pdfIn PDF document text
    • http://amajyuku.com/files/files/43816810255.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/teworujem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=force+and+motion+worksheets+5th+grade+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_off0000dc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5B 11060 bytes
SHA-256: 4e0abc76e836d289b3f91497333b5d81d3b1fcd81e8f4b2cf4c72d74b30f3238
font_01_sfnt_off0000f5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CE 17692 bytes
SHA-256: 515abfd8541ffe81d20d875c010e40e697eeeafbf0cb65b199cbe2dbda6233d2
font_02_sfnt_off000122ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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