Malicious PDF — malware analysis report

Static analysis result for SHA-256 de1f160f5b55390b…

MALICIOUS

PDF

81.4 KB Created: 2021-09-14 00:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a0679e33fa72eea4fbca1ba028fc71d1 SHA-1: 10cb19318565f035225b959e243d50d0b4d840ab SHA-256: de1f160f5b55390ba845384febd3bd958b96a92bfc56a0c0e4e2a4fb86835226
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://triatlonshop.cz/userfiles/file/degonigodid.pdf In PDF document text
    • https://dongcohonda.com/userfiles/file/bibatipiginawatotujo.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/5djua69lket34bdqhp44g30ac3/pelexiluzumoterowimudizo.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/41551452657.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/bb0428d564b08031455c57221c83029a/digej.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131b9ba70a91---mixofoj.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/44613387628.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/lewudamotaxakavisibi.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbc2e1a735---91321114834.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/13313825548.pdfIn PDF document text
    • https://protum.se/file/93073557412.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/xisow.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/mizikimirul.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/xotugomafurunodi.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/vivotenasi.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/muzasoda.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/58088919383.pdfIn PDF document text
    • http://grabnerestriche.at/9451964959.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/buzawexixunewoto.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/dotilawifipaxoruzunixuvaj.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/21061551057.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/47176351610.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/60703898889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=science+words+that+start+with+hPDF 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_off0000d50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50C 19740 bytes
SHA-256: 7050695b2cc09aa5f04e9525be406395694aa5b949bb68c4dce5715b48c55a7a
font_01_sfnt_off00010856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10856 10580 bytes
SHA-256: a9ce1b48f350064d89daa0ce01f72edcbf38901f61e65dd49179669e3bdcf578
font_02_sfnt_off00012081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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