Malicious PDF — malware analysis report

Static analysis result for SHA-256 7612fc6b35a183b2…

MALICIOUS

PDF

86.8 KB Created: 2021-06-29 01:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4b6c3559614e43e203e05f4422d75e2 SHA-1: a40a2c7244afba863b17228dbfea9990bd31a5d6 SHA-256: 7612fc6b35a183b25d268078e3baad689936e40ed4db5c6557ba6cd2c0c145ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress installations and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of external URIs and compromised CMS upload links are strong indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=16+anniversary+meaning
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c7211701faa---xogumotigoza.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/xivobamavepuxibipir.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/t0h2qatgqrrhgktunpbhgn4c43/wipifajiz.pdf
    • http://driver-jazda.pl/upload/file/bitiripefurasunufuri.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b5866b6e21d---78497645508.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5c7fd85d8---51796328569.pdf
    • http://cpspcb.com/uploads/files/gawowowireruveb.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c19dd6c9218---newepiluponusuzizojanaxod.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c202a1097cf---jorosufuz.pdf
    • http://ms-beauty.com/ckfinder/userfiles/files/1411556459.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076001520643---69565407174.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/4470a7279e9fefa591693d4c90e84ffb/73263081621.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/2c6bd0b8d3e8461770893cc748efc0bf/sivemod.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/i9tmcb4qbb4i6krvclgh609kvo/96656379189.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609050fb0b55b---54977242002.pdf
    • https://hzautomatisering.nl/userfiles/file/gadapufupedud.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af9f7d17099---juxokagobevikazerej.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8031987876---35713811013.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/52487685270.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5807acd83---676496928.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/b4a24e6123d8a43236681d748a526f65/giwiwuditezudiv.pdf
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/15117909703.pdf
    • http://skolicka.eu/foto/images/file/bawetugenalejarotibup.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/15a3d5e1a7257c578ebfd8405668b401/18703091803.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/v1j33jf0dq8fim6ssr5ijegbe3/xadejutidikogilu.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_off0000f02b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 16792 bytes
font_01_sfnt_off00010842.bin
27eeabd4a164653e031992ef4f0b4345c6009a82e4312c8e4805faa94d6f913c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10842 10492 bytes
font_02_sfnt_off0001202e.bin
3a8d0992a2acaf5d0e23ad7999c2e4f7a8cbd230f4e54570656c48894ecdbb87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1202E 17576 bytes

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