Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b744ce9727f1612…

MALICIOUS

PDF

71.7 KB Created: 2021-09-02 09:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 46bef8c8ab3d3554eff1e423ebd26dd1 SHA-1: 208a6b30e7b6ec09e396b7ba6d8ed222cd24d350 SHA-256: 9b744ce9727f16123cd368127c07cf684bc047460498c67d19dffaf93526566c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://amandamaitland.com/images/file/surasubejosixatex.pdf In PDF document text
    • https://adci.vn/data/upload/file/savofelilovinenogikop.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/286nraqb79lvnrpuirri62s6n6/toxalujizuxefatetiwona.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/nekin.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/13239140463.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/9aduvvjdfleqj6m33ns1d3p53r/viguniloduzoparadewoful.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/17597736269.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/1de0124b77d83e063964d1c16a030d6c/55070945631.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/21691524653.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/gatus.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/ec4ea0c7d7d111b711de2ec12916515a/59083731014.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071401333af4---42531518508.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/d984d352f1c4e718efa989cb305fb5f6/juradurakisuxekigopefu.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/35791122605.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/10255779663.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/kufeta.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/pa6lmss9hlglq9tqo6vscc7d74/fasukepumuzepomuvasivat.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/79643870427.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16112bfcc0b3fc---6331201305.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074200118f5e---13788014400.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/satisonopuso.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/5daaecc441dca9568a747dccd1b01107/dozuzo.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098b725b6d8d---69552969446.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/veviwafanovezametan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=meaning+of+value+in+artPDF 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_off0000babe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABE 10380 bytes
SHA-256: d015afb2de4fb7a934258bf7797f367a05ed50492e552f37792fb9ff895e3daa
font_01_sfnt_off0000d259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD259 15524 bytes
SHA-256: 1d7671e947a72312c0d55f2400ea6beaae8bb835b6d46ac85b61bf88cfcb84da
font_02_sfnt_off0000f9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1