Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04f595b5d1cc636…

MALICIOUS

PDF

87.8 KB Created: 2021-06-29 00:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b44dc4bae8e6477e50bbba0efde6cb5 SHA-1: 00dc05fc2730f784de8802d74de8ef58352317e9 SHA-256: c04f595b5d1cc6365e6cbd9a568da0d2c03411bf2ba002c19452fbb391afa492
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://medvor.ru/uplcv?utm_term=the+handmaid%27s+tale+streaming+3
    • http://otvorene-srdce.sk/userfiles/file/59844482167.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/9702bc2f3a581cf0334b773b742f4dab/83313953038.pdf
    • http://bhavalaya.org/ckfinder/userfiles/files/71963917991.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/q65taciort2at3ng5pr4d0e4d6/lujisixusekibi.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/o76slpfpmqho9gdkvah08dkn2j/17750935566.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a212762ac---76410339807.pdf
    • https://kovosluzba-praha.cz/res/file/39405632929.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdde8cb0b2---zutejadab.pdf
    • http://nktrading.qa/file/files/13263406786.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/d5ccb200952cfd249e472ca113acf1bd/xaxegule.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980138f41e5---takafojo.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160927a15db6f3---52008616670.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/832a24a375c408f99553037936fbdbc5/65994844331.pdf
    • https://locoffice.ru/userfiles/file/16537331279.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/g58024maij7f6m4e85q6erdhne/favaxonamu.pdf
    • https://atamergranit.com/userfiles/file/bigafamakudefolenumu.pdf
    • http://omonetach.pl/foto/ilustracje/file/fipejokaw.pdf
    • https://mfdesign.hu/files/file/pujesituniwa.pdf
    • https://contactfm.be/userfiles/files/manupigufavo.pdf
    • http://asianmosaicnyc.com/userfiles/file/5558022583.pdf
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/868b351a3a0146b0ddab3791e80ce100/62804738307.pdf
    • http://lexus-custom.com/js/upload/files/43403900538.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/fec9db3efa5c526be38be8fccb9edeab/rifemi.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/b9d1091d08ec2fa8450ce81007673eef/gokonafafujexanafunuduz.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/95b93b2b1b72875ba93022f323222df1/bibaxipejeb.pdf
    • http://rlangkhan.com/upload/userfiles/files/mozekofojipokarupod.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_off0000f5a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A8 16792 bytes
font_01_sfnt_off00010dba.bin
0550f9220b19c55549e7f79054642f65749ff96489c9c2d794a9e9e98f8aeaca
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBA 16736 bytes
font_02_sfnt_off00013931.bin
27f8b1d97a41f11a5ee4462f3beb195334ed5308e5c03022e937b7880a9049ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x13931 10744 bytes