Malicious PDF — malware analysis report

Static analysis result for SHA-256 15231769757ee91a…

MALICIOUS

PDF

87.7 KB Created: 2021-08-14 02:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: efbe26744cba744ef519d30ef2581a52 SHA-1: 9e769dd7bd14990e6b8483ab1990fcbd8749e70c SHA-256: 15231769757ee91accc8bbbf98375f24f6a2f762571d15f85ba192e83c029de4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The file's authoring application, wkhtmltopdf, and the presence of embedded fonts suggest it was programmatically generated, likely to host these malicious links. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a88da822222---boret.pdf In PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/fupefuxodebusopavo.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/65108495279.pdfIn PDF document text
    • https://saam.vn/images/content/file/12587209730.pdfIn PDF document text
    • http://finvestfortune.com/admin/userfiles/files/68959451016.pdfIn PDF document text
    • https://x-software.cz/data/file/pirepesasevarobitu.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/161054644eba62---6169890983.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/23180665792.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/zedajoxatifomivigewes.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bdcfae484---84702967418.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/95115755286.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbeca2c1628---fijuzexubajabuludezor.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/51726222364.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608af1b6f1ba2---64729865717.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/80167002469.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/70668619475.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/b469aeaaa33cf440b7d09b1c62dac9cb/83031146838.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8f0336ccefde2b2b6129af2447814439/dawozukopexutar.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/jezibexenoxugezowokoxofuk.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/45762016700.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/xivadekudino.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4e30abd79---fafikoxotifaxunelakux.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/347b9b8f2e52ff59c0ac061bca6aaf98/1666314072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=minecraft+new+update+2021+mobsPDF 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_off0000f00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00A 11348 bytes
SHA-256: e2723c8d79abb76af457af93c8c9b018f78b4e96d1c9a9b8f53bbe30172bdf78
font_01_sfnt_off00010aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA8 18120 bytes
SHA-256: 1abb791c144ee18a5edb1b9c3f9e3b7b52342783790b1efa84691dde1e09a6ad
font_02_sfnt_off00013934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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