Malicious PDF — malware analysis report

Static analysis result for SHA-256 e08683ddc2db0024…

MALICIOUS

PDF

71.6 KB Created: 2021-09-26 16:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d77aa8c336c2d4ace434abf66f485846 SHA-1: ee11ee6ccd0e0562321505420f022113787472b1 SHA-256: e08683ddc2db0024ca314d77e7e5ec7c96b6cd485a3feaf6b09cd52c235141dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, which serve as a link farm. These links likely lead to further malicious content or phishing pages, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://crewmak.ru/uplcv?utm_term=what+is+the+largest+country+in+the+whole+world PDF link annotation
    • http://chrisdepanneservices.fr/Sites/cds/files/dodudanurunojorapu.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/40856848469.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/fapitupimibowejobelufu.pdfIn PDF document text
    • http://ds-dq.com/uploadfile/1632186525.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/kemabuzokako.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/xefamifowogon.pdfIn PDF document text
    • https://kimcert.com/E/file/ribexidegasusonalilegekaf.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/35794446508.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/vujiwopexegasufulutax.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/28abcb6dfe68778931314807157024a7/77232627191.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614001b44218f---ripefejorosavukukaxa.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/49228706667.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/3927753811.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb5781b190---5903915193.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/4226153878.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/dikizomomakulovumeguv.pdfIn PDF document text
    • http://autodilygood.cz/files/file/91569596708.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/92012253777.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/68806164286.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/60861924086.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/8fc1b22cc5bfcdb0bd49fa4eab7cd2a5/xalasosapawonulofonibo.pdfIn PDF document text
    • http://kondicionery-bronnitsy.ru/upload_picture/file/xitutupagijevomaz.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/kalivetoda.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/dizafadowaxig.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/1360344740.pdfIn PDF document text
    • https://avukatwebsitesi.cicasoft.com/upload/files/31717012783.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_off0000b646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB646 10940 bytes
SHA-256: 9e70df8c772f91732d6e210d6a039aa79e7d557d5bbecb1853e81d47e501e2ac
font_01_sfnt_off0000cf79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78B 16036 bytes
SHA-256: e9a05226784aac4e9f5da3d5f58f05f086475cc52823684e30d7d07729c40f7e