Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a4ea6a251ca3af…

MALICIOUS

PDF

108.6 KB Created: 2021-06-26 08:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bef3615eae615b015da48453145fcc3c SHA-1: 2b0f8a01e98293e866144a28038a40161a9c9611 SHA-256: 84a4ea6a251ca3af8d59633841ac9c028f605a5de3ba03efab538d8f17273f17
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abdd65d9f2---nawuvagokakanalivife.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/e9a44b0f7f8b007b9c3dc4389ad9fba6/42601211171.pdf
    • http://buildinggodskingdom.com/webcms/file/pogufu.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609b589545ac6---84278251087.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160cef43270188---63011181845.pdf
    • http://planbmedia.hufiles/62665786131.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e5b041686---38273404473.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609bca0b971eb---33182734096.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/b5ac2f801f770d20808defc3b0efc21e/46822306865.pdf
    • http://ty-universe.com/image/files/20210606_151000.pdf
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/xulelofosokokimowamugaje.pdf
    • http://grandrosso.com/js/upload/files/49584364335.pdf
    • http://ckpak.com/fckeditor/userfiles/file/16472067336.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/05b691b632f1d6954bbabda1e1c85b71/69588220351.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/tvqp4hktstfmp0nhde6v4mg7e3/faleripegaditap.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/143d5d1f4565494da6980c8a1ecacbc2/24779918407.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a707e634e58---59877212838.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/86ef28c9407e6c343f419a87dfab6f7b/19745691048.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/d966872ad45d116015800a5c4301daf0/penizo.pdf
    • https://mintedimages.com/ckfinder/userfiles/files/vosodomoxuka.pdf
    • http://a-kamen.com/userfiles/file/59815212705.pdf
    • https://alihuata.com/userfiles/file/zemilu.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/75feb3ac3dc69dbbc5fed9cc9a07bc7d/40917106096.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=listen+to+the+cure+and+then+i+cry+lyrics
    • 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_off00014104.bin
687f650f6fafa46edd7d7ac471f37b742b473e86d3480d1be8c5e39ce25d30e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x14104 10636 bytes
font_01_sfnt_off0001594d.bin
c665078e0810e1f53e2274e3c54a4fd455a6b4919181ffd6838fcf9c20edcfd4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1594D 20804 bytes
font_02_sfnt_off00018d8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18D8E 16792 bytes