Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2c11133d222357…

MALICIOUS

PDF

79.5 KB Created: 2021-06-27 11:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 413c884796fc9831537a87d976d92eb1 SHA-1: 2b0aad5b42e5dfbd187362eda972a018be3a1457 SHA-256: ac2c11133d222357bfdfbfcc70a6f2e8470827bf1da4a9bcdbdeed3befce1ba6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many pointing to compromised WordPress installations, suggesting it functions as a link farm to distribute phishing or malware payloads. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://laborke.ru/uplcv?utm_term=schoolboy+q+and+asap+rocky PDF link annotation
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608456c7c8a0f---10741231713.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8a918e242---mategubeb.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/851ced190e08f9dad2fb79e9a98dd1b8/mebexewutejakar.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/70533548554.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/73284351154.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/tp0g4i6acg5sffu2dak2n3l8pv/11723602241.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/82764267863.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/fc1a761a9f6b0204b8d4f5f0e72a177b/44508278659.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/c859c6aaeae16892ae9fa52f2eba5793/42511633334.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/3556748353.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bb14e88a4f0---47497685061.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/616998c230377a3f535d106f9437e574/beputasokuduwibof.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/iivle6c33sdmupekl7l44nj9r7/23512368106.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/xidakojononufi.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/8445530545486cacb5bb1387461b1904/15498930154.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/d64tr0v1masuuj7cs6k63mbrmj/nikifoni.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/tularumugofijivag.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210619_D052BE29FAAA4902.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/53756609657.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210611_684A61F1E65F2385.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/bb6cb496c256050a4d6f26d35f26e07b/39139552720.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609278e327f4f---sosuzu.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_off0000d189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A0 10856 bytes
SHA-256: 2a6f06eb112bfd808770cc61aee4b16b55f9f4968fed7845fee7e0a38460317f
font_02_sfnt_off00010228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10228 17864 bytes
SHA-256: 46c089fad4cc6e1dbc08b5600428c698b6754b06efd5d6ca87895f7d6b16eece

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