Malicious PDF — malware analysis report

Static analysis result for SHA-256 840b85026bf2893d…

MALICIOUS

PDF

70.2 KB Created: 2021-09-29 03:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe6445389a06e4e189cbcf43519beb14 SHA-1: 0c316a44ecc7673b06e4fe83b96cb0d10bb08072 SHA-256: 840b85026bf2893d83c8f50cfe0412ea19a04e71941f2a1af7eb734242fb509d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crewmak.ru/uplcv?utm_term=clear+google+search+history+on+samsung+tablet
    • https://spyboarcams.com/files/35566654201.pdf
    • http://laconchigliacasevacanze.it/userfiles/files/85611310422.pdf
    • http://srmtteaparty.com/uploads/files/202109271551508363.pdf
    • http://henskeschildersbedrijf.nl/upload/benisakogizasofamiva.pdf
    • https://rowsontw.com/shopadmin/upload/files/figorikeguzatu.pdf
    • http://sictombbi.fr/ckfinder/userfiles/files/muvezalog.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133d5c2a03f2---kikuza.pdf
    • https://xn--z4qq44i.tw/upload/actfiles/92537066701.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134f98523b09---wifujuraxasezoz.pdf
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/95901302962.pdf
    • http://ccadl.com/files/20210916225230.pdf
    • http://mrybalko.ru/files/lapeda.pdf
    • http://www.tecnobor.es/ckfinder/userfiles/files/13713995410.pdf
    • http://www.recko.ru/ckfinder/userfiles/files/jilapenat.pdf
    • http://chirineli.com/img/lib/file/mewuduvigidabofawo.pdf
    • https://www.tunnel.de/files/uploaded/file/movemodogebu.pdf
    • http://lachina.cn/upload/file/13249562631.pdf
    • http://mastrodibaglio.it/userfiles/files/gevadutiwujuwafe.pdf
    • https://kaparatt.com/images/File/98550623886.pdf
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/25254324812.pdf
    • https://limblength-sldf.com/userfiles/file/tajipunesajef.pdf
    • http://apismorava.eu/docs/98165617569.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4104b357d---43152899770.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_off0000b147.bin
8c63d8bb16dc0c564ce73ba94fbd68a825a99cb595c4e267e3818d45d2d9aaaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB147 15640 bytes
font_01_sfnt_off0000d92b.bin
5091a86e4370782ffb21f210adc129e7f63e533cac431fcc4a10d1b5be636e26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD92B 11060 bytes
font_02_sfnt_off0000f2c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 16792 bytes

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