Malicious PDF — malware analysis report

Static analysis result for SHA-256 0204bf5c3fc0a9d8…

MALICIOUS

PDF

69.9 KB Created: 2021-10-01 19:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7e2f4f7a17d6a7e6eebb1cb122ce6f5 SHA-1: c91b1df93da46b07a6342ac387a070b387ecdf5e SHA-256: 0204bf5c3fc0a9d8c566fbb100ec0c467561858396991d6f4008dd7acd27d617
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to lure users into providing sensitive information or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://archism.ru/uplcv?utm_term=forgot+my+gmail+password
    • http://panel2conso.com/userfiles/file/94313699147.pdf
    • https://odontologosmalca.com/images/userfiles/file/bilewa.pdf
    • https://rimsball.com/ckfinder/userfiles/files/werinagabovisutiza.pdf
    • https://xcheck.vn/uploads/userfiles/file/94508261213.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16143142028965---pepavedipojubofu.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/aaee1cba5a65dd610886f8cd213880b9/jolalo.pdf
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/xirowidimovokad.pdf
    • http://sinners-party.de/media/file/33152086797.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/4oh7kiqonrm7ovuug7ki8i4pnk/risobenujopisiropu.pdf
    • http://www.singchai.co.th/ckfinder/userfiles/files/95757702761.pdf
    • http://gdfsztal.com/uploadfile/files/tenufarafunirumunokamos.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c3410e7d3bb956955641cf0e66cd0cc8/81822995058.pdf
    • http://slsnn.ru/content/files/votepefarofogud.pdf
    • https://samsunyapi.com/userfiles/files/14725162839.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aca97565a4---27979031536.pdf
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/bakod.pdf
    • http://lse.hu/userfiles/file/vafilenegasutoduwekajat.pdf
    • http://abwferrellpkwy.com/uploads/files/50040438912.pdf
    • http://doorsatyrau.com/ckfinder/userfiles/files/46396829862.pdf
    • https://blnk.eu/userfiles/files/16909859939.pdf
    • https://pielinks.com/UserFiles/file/tujomifupagavasoledi.pdf
    • http://eko-baby.ru/userfiles/file/maguxovixajagegejifesux.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b15d.bin
c5432678167d2a4ff2c9c3cc72018ace6c0f0a904d6653059dbe8cd70c188443
pdf-font-stream PDF embedded font (sfnt) at offset 0xB15D 10676 bytes
font_01_sfnt_off0000c9b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B9 16792 bytes
font_02_sfnt_off0000e1cb.bin
6e1afbf52c9e2d286ad7bc1024251216b0e4ab80478b15aa53e8dd34bfbc9d3b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CB 15960 bytes