Malicious PDF — malware analysis report

Static analysis result for SHA-256 73039449c1c6f86b…

MALICIOUS

PDF

85.1 KB Created: 2021-08-10 19:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: da848a3b8e469dfb298f0b2e3df9107a SHA-1: 1d5e311b7a9c09365fbebbcbed8a544fa4b35c41 SHA-256: 73039449c1c6f86b94e8373775eea823d4a7054ee694ae2b177141350787b51d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs suggest a link farm designed to redirect users to compromised websites or phishing pages. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic of leveraging disposable hosting and compromised WordPress sites for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=how+to+solve+charles+law+for+t2 PDF link annotation
    • http://www.valathors.com/ckfinder/userfiles/files/pojafokutatatorel.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160da266fb97f2---goreresivub.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/71609862309.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/mowaxosojipewilap.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/62471492108.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/97717904142.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/sewitolariputuribi.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/30858410547.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/50600791512.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/sitakupejugupuzegakaru.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/ikck6qb7bgt0comabbudubjnrv/suwavisapi.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/glm96m808d37mqe3vu54s7lof5/35958705987.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/10121704275.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/51895145456.pdfIn PDF document text
    • https://superpart.com/files/lebisuwedudap.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/l6ed5mch5b34i1gvdaodnt20v0/xudavenigovapazo.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d587b4c62a---83930480008.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd27bfea65b---lovapudojebatur.pdfIn PDF document text
    • http://goref.ru/files/file/23765989460.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/es6ndmcvrbq32aikjnd81l50me/18525755849.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/f5a4828ceb48955177b0e615679a810d/90259487301.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/boxoduzulawa.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/gexejujezogijobevumurevim.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610fc717a10a0---70351827606.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fb6a3b132---11454304266.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_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 10500 bytes
SHA-256: bb48c999cc0028e0f2eaf432f9316f36b453f1da6dfb9b40a42b9d9804dedb12
font_01_sfnt_off0000ffa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA8 17672 bytes
SHA-256: 76ce1d5b61e3aa23df4ebd1c7b1ff7d0467846f80ffd1d408776221ae2bcc8e7
font_02_sfnt_off00012e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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