Malicious PDF — malware analysis report

Static analysis result for SHA-256 70832c888670272c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-10 08:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a2d49f463a435fc7e658c8c81ef411c6 SHA-1: 36509cade3fbd8ddb29affc378c16da409686d20 SHA-256: 70832c888670272c801e939cc449554d3810b9853848bed02a14abce509a4a5a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable domains, a common tactic for phishing and malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive, which is then decrypted with a provided password, a method used to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://rbtyutj01.com/userfiles/files/sesifajesabepopunuwi.pdf In PDF document text
    • http://zenobiacultura.it/userfiles/file///nexifafibum.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/27989393376.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/legelotadupijizovamopo.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/xuxodakazozujagurefutuwe.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/11493892281.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/mexuvogegitopizo.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/3167656791.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/67420350421.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/58986432350.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135505eb3b25---76382378355.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/vedukil.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161387181d100b---jazexagowiw.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/kizomenubilulexupe.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/37810792826.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210907064700.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/faferitazapenitiwosupita.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/sugewomamaxiwidazoz.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/728857010.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/85116cb590b3a5ce481577eaaab6b368/32783835027.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/juvum.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210902132710_kl9ivu.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/98175403020.pdfIn PDF document text
    • http://sin-hua.org/userfiles/73607406348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=safe+mode+off+apkPDF link annotation
    • http://irodori.kir.jp/files/file/95106126736.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_off0000ddc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D5 17648 bytes
SHA-256: 6af37227e995eb923791b55d4b78981b397007168d27acfeaf1cb968c295c04a
font_02_sfnt_off0001235c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235C 10216 bytes
SHA-256: 8b59977a0a4fdec0a636d3d0a9893cc110f7fe207c08b176810c1f446e75d439

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