Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6cce8e5b050c54…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 11:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 43dbcab978b9f7efcf5836433c33fb08 SHA-1: 1459c97a441013791781fba4c480a5868a7341a2 SHA-256: fb6cce8e5b050c546e2680804b130c4d27404407554f4bdbf683c3760ff765cf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to link farms on disposable hosting. These links are likely intended to redirect users to download further malicious content, as indicated by the ClamAV detection and ML classifier flagging this PDF as malicious and phishing-related. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://inwebjor.ru/uplcv?utm_term=windows+7+home+premium+sp2 PDF link annotation
    • http://emekyesiltepe.net/images_upload/files/kuxitigenexerezi.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/64876722438.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/12529709745.pdfIn PDF document text
    • http://caythuocnam.org/images/files/15748403363.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/letaxevetoxapogorexifak.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/gedejusakesejuj.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/4265779427.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/pufuvobapogoxijowavexe.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/vabuwulu.pdfIn PDF document text
    • https://asi-filter.pl/files/file/lovuwivoxupofopinuk.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/66501147598.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gklsuvi9hh6stree57k5k80vie/34933739646.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ce5c6eaf3---79023139795.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140478b676bd---mewulujepasogu.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210914175803_f9rvd6.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/83969636946.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/36194860256.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b515aecff---13222092542.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/58232894880.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/13800485196.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/83929938793.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/88164269440.pdfIn PDF document text
    • https://sopkambing.com/contents/files/92790025479.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/4485165073.pdfIn PDF document text
    • http://hklh.vip/data/attachment/file/xobujepolafurekixubewefo.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/tegadok.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_off0000b18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18E 14908 bytes
SHA-256: de2e239777b0a8af91caf480d8ac924eb0f0e03cdfc899545133cd70f4286788
font_01_sfnt_off0000d6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CF 10700 bytes
SHA-256: 1b6fe16e75f017a4ed24ef86daccd7d4cef2ba7bc36c16016d23e3aea53099f6
font_02_sfnt_off0000ef3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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