Malicious PDF — malware analysis report

Static analysis result for SHA-256 432501d7993cce5f…

MALICIOUS

PDF

78.6 KB Created: 2021-08-27 13:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 540e9e14aaa277df127d2c4d67f25a8f SHA-1: f03ca555b7724436c67e4bcbf5fc765e8e7dd158 SHA-256: 432501d7993cce5fc6299d546875d22b80483bc10ce7c43ff9e018156e593416
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://smidgel.ru/uplcv?utm_term=grade+2+maths+worksheets+in+tamil PDF link annotation
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d2c1ef701---63154249717.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/0qfhivmrt7fjmrmqc8k4ilo5no/67260661366.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/b000befd694d1d7bde6af7d5d3569cd0/86248182784.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/disajeserexosavul.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/fexenirefolexenitowifi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609471e81ffc4---mafirorogufefusugin.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e227973cdc---46928410651.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/8cea5e96db5e9ca3651e036208545c01/pativedubadodonok.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098833a8ec46---22472813907.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/5f9e27cd163eb9aea6c4cec31629efbc/79893551284.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/mcsl26kksbotcsk8r5o22r28hd/nukexebaro.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/0ed1f82df3fff51b4face7193726654c/20703311972.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9bac744b8---dojirizajikazuwifov.pdfIn PDF document text
    • http://poorclarescork.ie/images/jonuperakenuli.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/63e31e3d50f51ebf14ed6c78bf84e98a/25925033764.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/kamoximaxavo.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/mipevafipisulatudadabele.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4859c6af31---bazuzed.pdfIn PDF document text
    • https://ms01bet.net/contents//files/xalarinefiro.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/63556752606.pdfIn PDF document text
    • https://airbays.com/userfiles/file/18084253556.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e8c98a9bc---68965962821.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/maxalagedi.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/8e6612fec4e1c43744d5adcae4468f6f/kisoparo.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/1888200048.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_off0000d1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B7 16244 bytes
SHA-256: 33e62595ce8494d6a0e03e6072fa0cfb25ba7ce410234ebbee9357cf92e9ffcc
font_01_sfnt_off0000fb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0D 10852 bytes
SHA-256: 2dc081e912e08cc83a2b6d53325b78ff4be080cb6dc9e424aebfcec13c40ea9e
font_02_sfnt_off00011415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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