Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26bc80e27bb0be1…

MALICIOUS

PDF

120.1 KB Created: 2021-09-02 04:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: be0b2d36d3878dc83ac438a6856c28b1 SHA-1: 8dfb9448879dd8b0f21d592c9bc0858d5d60ce8b SHA-256: f26bc80e27bb0be19b07d302b2ebf3f0d3751400fd9313631f0486c23cb919ef
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, designed to redirect users to potentially harmful content. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=red+hot+chili+peppers+road+trippin+tab PDF link annotation
    • http://refpecsbelvaros.hu/kepek/files/25825241775.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/8c2db0445ec4961a2c34a2b59a459335/31916641026.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/94632057613.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86d20ef7c4---zitunuxepiloju.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/lb73qibhr68pohlg653iounc61/fozoje.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/6836674977.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/feseporafenarabusavego.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611f195bcbb73---51214096431.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/tabem.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/gijikifena.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/3ac2c64dcd5220d258eebc3a0e35d688/22858567622.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/5d728c8b31dab716d468f8dc111de4dd/37302457438.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f8fde9b96---dobitilibawawulovifixupuk.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87876e8add---dusabegekedigil.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16101325fea1d3---zuzunutexizunu.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/f74bc52a57a6c17c380d0cfa6be02fc2/kuzubepiwapapasano.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/b6768805c8119290e2568434498e19ee/6115821858.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbe6c1fa80---87802735847.pdfIn PDF document text
    • https://koratspring.com/upload/file/26140338597.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210708_9719587023D9D30E.pdfIn PDF document text
    • https://dcimx.com/files/sekodusugubofifiwadiniti.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/xofubobaw.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_off00016eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EFF 19588 bytes
SHA-256: f138ecdd49ab1277eac9355be5bfa781d69a69fdb237b947bcc4062a3fa14095
font_01_sfnt_off0001a22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A22E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ba45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA45 10796 bytes
SHA-256: 57507347d3a43277ae3490283ca9c8ebb6edae185b602691efb4562b9dead01b

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