Malicious PDF — malware analysis report

Static analysis result for SHA-256 13dd5e44a6520471…

MALICIOUS

PDF

74.4 KB Created: 2021-08-04 02:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a39ed8b158b0ab6cb04314a079c28157 SHA-1: 67d83bfb3e0da8a142d9cb71f2b0cf81f043af79 SHA-256: 13dd5e44a65204717bd25bd71f8698535719e2da7c34c1adb84a07500b3e8f83
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/atde6025hnnoe0tl5droj6ospm/bemanuvakuto.pdf In PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/8ed5519dca606fc6c90901d7b5e47b57/13328454463.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/68156683113.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/4004519858.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/nigegolire.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/pexejemavefonadapezusivij.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/vasidajuverobupopazati.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/71110928168.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/rirexalezasubiwuperox.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/ddecd9c11ecd6852c87b2bf8ccdedb2a/jigulonu.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/36897167688.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/43843683427.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c25d9470e81---temosanovisirab.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a90c7d13---38127532058.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/733f1e4d5619cf9a996e8d63a8b92454/webulevufiwexuziresega.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/94aaa3f8789b8871a647828f4c07e5f6/jafubawi.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/besewafajizunowuvopikab.pdfIn PDF document text
    • http://iccarrentals.com/files/file/rakiwo.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/24815576728.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/64294defcf7fad985acca7db4175087e/60091569791.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/namigokikuzukewusil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=musica+del+recuerdo+mix+viejitas+pero+bonitas+en+lineaPDF 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_off0000bcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD9 11204 bytes
SHA-256: 0fb8fc4ab35cc4f47b2f0ee4b10d97e0d6ba9a2b17551dd45a5deb6af338478c
font_01_sfnt_off0000d6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D3 17112 bytes
SHA-256: 3b475329905db45498de5717acc5c6a771d93809467f8482b4e97a75281c315f
font_02_sfnt_off00010192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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