Malicious PDF — malware analysis report

Static analysis result for SHA-256 43700cbcfbde7e87…

MALICIOUS

PDF

100.1 KB Created: 2021-06-26 04:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e8854e0035bc315f9239a2c8844b433 SHA-1: 389ad0ce472c7e154dd57968bfe9cbdb46573ba9 SHA-256: 43700cbcfbde7e8770c0b01bb47dde6d2e98bace8f932ae066b1ecc4c48a808d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains numerous external URIs and link farms pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is likely intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://catamma.ru/uplcv?utm_term=the+hobbit+there+and+back+again+book+pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609eafc5e08bf---39555480292.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d3a1b75c1---supegipasaganimewiraregi.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a6dc987c0---puludadifuxasuxun.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a18f21140bd---lofosinagudobuxumelobi.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ad17d2959---81487745433.pdf
    • http://omonetach.pl/foto/ilustracje/file/97089158993.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/7b0318e0e87d9264d214ea6edbbb4270/bipetudidilalofe.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02942e8db2---10880034486.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/515a5a0ca54ebda0d25da47832bbafc3/82449734928.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3jtmqn2rhrgj3d188v3ahfo3t/11917872275.pdf
    • http://didocrosby.com/imagenes/file/pidiledo.pdf
    • http://bensonlandscape.com/editorData/file/84198069649.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/eadedb0f427c321595bbbd04fbc49eee/kusupadetapolekezojunoxev.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d6ff6214693414b316ba2403c0bc9589/16580372911.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/2d1353535e8a5e8bd558247fdf9155a4/wolej.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/xugetub.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b2558b2d4f3---74109537644.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/459f2f63a018cc135b0ffcb1134e9302/rilibumagukunesojesixaxak.pdf
    • http://novussiteyonetimi.com/uploads/file/67787028538.pdf
    • http://russkiivopros.com/images/FCKeditor/file/84657677936.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb726064d9---gowema.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/rttn89u6bh610rn5371shso82o/11856405519.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010071.bin
cf6e1a8dbf9304d8ab4dff90e523f2bf6d69cbe85b79b0bba3e23a785a98358c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10071 17836 bytes
font_01_sfnt_off00011c13.bin
a248afc9647b16f45ae3321b291c15fffb691cf56536848e38f023f2865f641c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C13 22068 bytes
font_02_sfnt_off000151b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151B7 16792 bytes
font_03_sfnt_off000169ce.bin
e3c5d00e4ed5ef6c4effe326e43270987e39d427924dab751f65d4e5fb739da1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x169CE 10880 bytes

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