Malicious PDF — malware analysis report

Static analysis result for SHA-256 922023eca91b6bad…

MALICIOUS

PDF

100.1 KB Created: 2021-08-03 21:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: eba03f578a2045bc3c26cb208f8bf182 SHA-1: 172f47d0db612d5b935428e1e2bb0ed174836547 SHA-256: 922023eca91b6badb780eab5ea31f65b7ff8cc9be08ffccd3a363600b2bb4b85
164 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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hyeminshop.com/DATA/files/67924736671.pdf In PDF document text
    • http://centralgiving.com/media/userfiles/file/dewurolifitavimefateleluz.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/madijelunusuwomobukaba.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/xejosesi.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716a1347079---mudijerisogenet.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f2abf0453d7---84670417370.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609832db61488---winutodeladozitemev.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/af606e3669c0429cc981ca1d81b63f8c/fekuxosunipi.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/72780665510.pdfIn PDF document text
    • http://abpaluso.com/upload/file/74477777516.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822da55ad1e---72873564820.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/sekuwikupikutuwexoka.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/cpmadusp2iv0r7gt027tqdddpc/88975187087.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/35604358254.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/13151bff5d5d9fa3b8e23c53537a53fe/sokipat.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/walinidemir.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/29991306139.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/simivas.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/1351189892.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/57530197233.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/5320363807.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/d856133f9223f5bec2218f9c37f7462e/meluwimitolilexo.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/64223180456.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/79113396242.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/simovixalomaporexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=tabe+11+12+practice+test+pdf+level+dPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 10732 bytes
SHA-256: 83605367f09210900949c4bc26704763a1b53b3786b7aa6f882b5b6b7bbe9fc9
font_01_sfnt_off0001205f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205F 19028 bytes
SHA-256: 82038417d11ce338eea8a84e4b76b3f054f3468d3a6cb0bc6e8e19b1f3b020c2
font_02_sfnt_off000152fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152FC 16128 bytes
SHA-256: 6cbf4b2d424c4b5a7ea3b2faca4e0ea673ff10147d2bfbe2f1e880ab77e31438
font_03_sfnt_off00016866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1