Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfcc6d2a8cde6bd9…

MALICIOUS

PDF

69.9 KB Created: 2021-09-14 09:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a28d52e888b26de58b5808249ad270d5 SHA-1: 85954e0cf3ac5af2fcd13a8c78fa419a7241906c SHA-256: cfcc6d2a8cde6bd9815b8122e68ca6a25cea14a63d43323e8dc99d2c4b79b634
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure of the PDF and the nature of the URLs point towards a malicious link aggregation strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://robbes.nl/media/files/40877283627.pdf In PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/wotalede.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/54894992766.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210914_4FE70CB9FF83B527.pdfIn PDF document text
    • https://il-gusto.com/images/file/39241984323.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/wifaz.pdfIn PDF document text
    • http://thaide.org/userfiles/file/xawademovodizivekib.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/36909601084.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/fuwizizozotus.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/xolokuxusukuxebuxaraduta.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/11158379685.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/mb2j505kij9b96i8kbmf2r52qi/pajozezunososenomepemo.pdfIn PDF document text
    • http://dr-temt.ru/images/file/nemexemawamabaso.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2ff718c84---98229463838.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/manuduvejuselilur.pdfIn PDF document text
    • http://keacg.com/upload/files/vabekokemapibibenaxika.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/35389725465.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/41248806044.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/5355522596.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133266866f08---52097691552.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/32581243792.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361dead9196---nafevebanowewovezoxabulun.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/3418acvcs9el6muqsmhaljc66t/poxagokikotagajilig.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/guketinodibabaxeritutu.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/9ab45985d15e0ceb5f1b61586d475199/jotamufuboxavulezimusam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=best+offline+soccer+manager+gamesPDF 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_off0000b411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC23 14888 bytes
SHA-256: 402b1174bce5b303eb657de64744621df80f1ecdd2279e3b20bc432f3722943c
font_02_sfnt_off0000f157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF157 10732 bytes
SHA-256: f041baa1b23fdb4e26893dbdc6ab9e0e545b2e24779fa7b3a577454db9b9b4a1