Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf0dd0da3ab54a7…

MALICIOUS

PDF

77.6 KB Created: 2021-09-01 15:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6613cc84ca561c9a5302bf4701624bb6 SHA-1: 9dd34ce8a95fcf465e22754e6b9c45fd8cc7064b SHA-256: dcf0dd0da3ab54a7a41fb2894dee46a8b3d8e736af2c9bd935bf7aad32f036b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=find+present+perfect PDF link annotation
    • https://gregor-biffiger.ch/userfiles/file/pogamaloxumapumexixugiz.pdfIn PDF document text
    • http://monroehighwildcats.com/clients/40160/File/94810728997.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/57404700222.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085ea7d02e44---8757382856.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fcf32a48d---54167675975.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/16872971367.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945ad6e04b0---tixogexu.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/7b62c05858d6e2fe1bcc0c672063bdc8/94234118330.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/mikesaxafejigobajixel.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/lasem.pdfIn PDF document text
    • http://canoeing.by/pics/files/vimonakirefagupeti.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160876a7f950cf---39241476830.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/f03932b37949206b2e5e55346ce3715c/baladinepopebumemo.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/35989754236.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/bqod7oqggqb5f4pavbddeomt45/49708493413.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/gakirodikagitoni.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/linuletubibavote.pdfIn PDF document text
    • https://susta.vn/userfiles/file/kevixawedoji.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/70853525166.pdfIn PDF document text
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/zatogalonedogapunipasot.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/romijadadubezoke.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/16771319892.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/mivarererelaxiwogawe.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/zunowigaboxavotibomi.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/49862379519.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_off0000cd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1D 10260 bytes
SHA-256: 82b69a8c8ac74c364d802690be35187e558c712e19f3c9b22abb1e1b73354c63
font_01_sfnt_off0000e442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE442 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC54 17556 bytes
SHA-256: ab602aa77bd1ddf496c3b3f23e6dcea1a15fd7187415923db7f62707a63dc7e8

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