Malicious PDF — malware analysis report

Static analysis result for SHA-256 b759b779fbb65af9…

MALICIOUS

PDF

70.9 KB Created: 2021-09-15 11:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9471a0d8be854887266abc7131ae9b99 SHA-1: 42f90a44d9bb4b5ac49c9c18bc7788ad5870df26 SHA-256: b759b779fbb65af982f607de0843ac0abdf0a34068d46e59a576f0ad14452d92
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, characteristic of a link farm used for phishing or malware distribution. The presence of a compromised CMS upload link suggests an attempt to host malicious content or redirect users to malicious sites.

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://vejwun.cz/images/86635274047.pdf In PDF document text
    • http://abimobiliare.pl/pliki/File/1181757558.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/rabumixasapokuxaxugav.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/xitagusamusubabok.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/jobibufepujokajorofal.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/39850441296.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161365cdd46a92---75154192972.pdfIn PDF document text
    • http://packamate.com/userfiles/marezazido.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/66800116106.pdfIn PDF document text
    • https://agermag.ro/mm/file/69969969702.pdfIn PDF document text
    • https://mackbeks.com/files/file/32760935572.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a50b6606d---14676130192.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/finano.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210901170615.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/51318521886.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/57879931687.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/timoxorogixejifibapim.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/24858779244.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/88215153226.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f6e7b5783---lajuk.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/bekadunusuninegoradaf.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16134a7b763eb4---82359884832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=gta+san+andreas+modern+mod+apk+downloadPDF 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_off0000b2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AE 16820 bytes
SHA-256: 2db7c637ba1dc611d7508ad6775ae2c8c56133d8c44c2ff2409a4e1c62df122b
font_01_sfnt_off0000ddc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DB 10680 bytes
SHA-256: e2a8c2fba5f86b264383eb42c929c15dc0bcb0dd84126f2edc4afa34ae470929