Malicious PDF — malware analysis report

Static analysis result for SHA-256 193268ff6fb6c9af…

MALICIOUS

PDF

88.3 KB Created: 2021-07-24 04:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 60e8f4b855187f26a4f80eceba36136e SHA-1: a5b14995b59043b4e48978fffb92714724b28a21 SHA-256: 193268ff6fb6c9af9b5e1b0208a927f0e120abf7aff462bc4e9d6b9059be78bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2ff8e8a5---88467992150.pdf In PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf12cddc7f8---6942639558.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/5556979226.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/wapetakebimi.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/dmmo2nnfgvm45dr5jer35r3jnr/xilenurewakawiruba.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160852112aad6e---77970122910.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/11251013932.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/pebivabisodakogab.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/bekewasulopibuzoxuf.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/83990926672.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/63630075325.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/7dbcb6427b30d3f8fa41cb1035b5b3bb/59421676912.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609c80bb7ad85---favakuduxurijoraxiwi.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/rezite.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//90093922612.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/1638427949.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/zefosogorire.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/mqccqsd3mlggdlucfj5urqhlvl/kuwuzenepudipotami.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/90576265728.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/77008726990.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/borimexomaregizama.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/bazuwaxewibuxexedefuku.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095fcd4976e2---kubamufasetubapefevewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=ge+adora+dishwasher+manual+drainPDF 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_off0000f6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CA 10640 bytes
SHA-256: 3cbf7a5c128b9218d5b0fc01fc049678c0b38bf9c49b61c471a3ecd988824205
font_01_sfnt_off00010eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEE 16780 bytes
SHA-256: 7ee0f55224434d0e3d9ee5a9d0bccc5a5349f239253be4ef4fb9bdc763bcfb22
font_02_sfnt_off00013a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1