Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3703f9eb17cc44b…

MALICIOUS

PDF

83.3 KB Created: 2021-08-18 02:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 34bc11767a3183594b7a96ac56a5c2b5 SHA-1: 69260043f8bb7ed5f1954c546d73d80493f92793 SHA-256: d3703f9eb17cc44bc848e8c9eb35b8b1c4fc6d66a1043a001b99746d7b94815a
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external PDF files hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. No scripts were extracted, but the overall structure points to a phishing attempt to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0a8037d0---zefaxuliseka.pdf In PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/582fcfe4050c110e36a4da44767d4d77/51413042762.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/96804491214.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16095ce0fc7f76---58894318404.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/epm2t36lejd3i5ttgjj8d6icns/96679192443.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/b1de40296b7f03e70457a204787bbd01/takogum.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/37841773836.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/70621906042.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/xanovufixadizovave.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/7124767220.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1e6cc7e4b---99300358529.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/tarakokipiwaju.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/jozajozuron.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6e350fd3d---viponiser.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/45esnmg1oavqv5mu61hpqc2696/rifesuratuzupegakudilevax.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16119244a5101e---zilexu.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210730025533_1226618174.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/dlqcr95kdpshfhbv9q8vff2ust/muviwomubabed.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/rizenetozexebir.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/jabejuzuzakesubutowarifak.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/93175059009.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/fonoveguf.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/gagojisoresodeluzo.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/ohp8p0h3fg691ji3enu0aik0n1/sixijefotobafokalurazifis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=sample+business+proposal+letter+for+partnership+pdfPDF 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_off0000df51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF51 11076 bytes
SHA-256: 127e2c6b82f68c2c4dc45abb400f8fd792f77d297d3cfca245ede05ca83fd1b3
font_01_sfnt_off0000f8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B5 17320 bytes
SHA-256: 1ddc5bd9a3045d23e58433dd87a280e45643ad13a01f70a4f239425c94f1fd4f

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