Malicious PDF — malware analysis report

Static analysis result for SHA-256 f322eac4fb31b18d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 08:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b845c7d03338164bd4e5d9a6b7dbad6 SHA-1: 96210a18aa0330424433b31dc23470df4e56e013 SHA-256: f322eac4fb31b18d8e4d83239613bcff777ec25ac2a0ede8aeebccd304157710
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious content or redirecting users to phishing sites. The heuristic firings indicate the presence of a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute further malicious files or host phishing content. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://cargotavio.ru/files/file/37888363575.pdf In PDF document text
    • https://trunglamdecor.com/uploads/userfiles/file/buvuramirukapibolenireta.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/55buabdv6clvs3fi2id4vir2ho/25538722029.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/buxuvurivadejejuwi.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/tagodedewu.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/nofaxala.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/duvesapajajevenu.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/juwewunalitefokof.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4db131bdf---89520400152.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/67711081958.pdfIn PDF document text
    • http://chapelguild.com/images/usr/rifukesomoxavoduz.pdfIn PDF document text
    • http://xn--h1aaebbkfib4a.xn--p1ai/sadm_files/vizetitorexomuguso.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/80187263582.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/87077dd55e92d9e7c8651c8e75293a5b/kewudutajubowexasomubo.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/7160962432.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/binoxamedumi.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a080a2c74d1---90682362019.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/mabatinumu.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/31801879666.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/zirupolu.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/jejexogukivipufizipov.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/91r2kh3k75us850ihm2kjsuqnq/todipimere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=summary+of+contents+of+the+dead+man%27s+pocketPDF 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_off0000d8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D0 18324 bytes
SHA-256: 013d31dd3a431adfb9b14fb41a2416c4ca71845396b62d5a3a5cc73fb391e953
font_01_sfnt_off00010818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001202f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202F 11164 bytes
SHA-256: 942097443a6d79bf61fb3db8f03d3afd61d2e275a4b73ca944433271142c6c9d

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