Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c405b7a168c4ce…

MALICIOUS

PDF

97.9 KB Created: 2021-09-22 14:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d6ceece8f47ef052ae3dd5114c8ab198 SHA-1: a7124b49b7df3739e207b5f1a786aa472903580d SHA-256: a8c405b7a168c4ceecf988ca9101fd197b716fa0f537fcffd5798de77a13b28c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to other PDF files hosted on compromised websites, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic of providing password instructions to bypass gateway security for an archive or attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://sumisaedu.com/FileData/ckfinder/files/20210922_13C6B2A82ACB03DD.pdf In PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/basebijenonarazezeseto.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/53191209364.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16136423851aed---51646182558.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304ebd90266---66656124124.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d333e4d223---pavulawosuvu.pdfIn PDF document text
    • http://gardatrans.com/content/Files/88822649996.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109151947237611.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/28431578495.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/65652194864.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/99127348484.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380ad850b51.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/wejefaximujesikugito.pdfIn PDF document text
    • http://btfa.tw/upload/files/39173278786.pdfIn PDF document text
    • https://emenu.hu/editor_up/gipitokuwaze.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sobozaginaxanir.pdfIn PDF document text
    • http://ukrfirework.com/images/file/70545478876.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/ed8a33198965c04c60567dec434bff7e/xogijawagefu.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/rifedozegogebutuxuli.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149d9192a9fd---mowevoxonorebev.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/75346085659.pdfIn PDF document text
    • http://tajilin.com/upload/files/62918107081.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/lipazemofemujesudop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pokemon+light+platinum+cheats+ndsPDF 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_off000117e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E3 11052 bytes
SHA-256: e0139d5b748ade2eb1eef3ed5c6b3320a7885dea38be5db5eeafba0f3e7f263f
font_01_sfnt_off0001313e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313E 18368 bytes
SHA-256: 20c1a332ad4503955f33022abf541722f519e8a4493c47d9bcdf5d5e8caa5afb
font_02_sfnt_off00016118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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