Malicious PDF — malware analysis report

Static analysis result for SHA-256 f068acffae3c778f…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 13:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e81f1f0ea49afe36af2ec209c46ea3c0 SHA-1: 9c893a2f6754c77d6a52be700e559b7e0d98444d SHA-256: f068acffae3c778f86d6faca1e601b39aa675b463cd5f3b0822064101e761ae5
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 a phishing trojan. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to malicious sites for phishing or malware delivery.

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 http://proxima-design.cz/files/file/17371376146.pdf In PDF document text
    • https://ubranni.com/uploader/files/22698057134.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/48738961593.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/48894900964.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/184fa5ugcn57ic54je066q40t3/xinitiwilasav.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/46222784471.pdfIn PDF document text
    • http://allycatering.com/userfiles/32960062194.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/95253654d033274f2b987f1e51508bf6/97460279347.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/59232307943.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614082396e251---86648578156.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/venuvononupodofil.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/58360153408.pdfIn PDF document text
    • http://asid.rw/userfiles/file/30083105240.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/siwibuxu.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/88878585371.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137d0b7800a4---jaxajativunemezujozax.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/rodurogolokiwo.pdfIn PDF document text
    • http://calisnt.com/uploads/files/bowerob.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/42712179371.pdfIn PDF document text
    • http://dentistturkey.com/image/files/zitob.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/fepiwuzamisik.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/fimox.pdfIn PDF document text
    • http://szm.hu/userfiles/file/6676707189.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/bomovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=galaxy+note+9+not+chargingPDF 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_off0000e3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D1 10764 bytes
SHA-256: 5054f1288f5d9f953b67efea036b891d50b749c9d0a4914d880ebd188623c898
font_01_sfnt_off0000fca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B6 18380 bytes
SHA-256: 4603dcfbf4ae71c6c53a60d720fa5cadf5d8ea7e6daa469cc1014bd3f67585b9