Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43d521e21b5e570…

MALICIOUS

PDF

88.8 KB Created: 2021-07-25 00:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8669075701e2329dbd814c80f399f681 SHA-1: 41a65636b39f410a6aeff0f5dc5681ec29d19815 SHA-256: e43d521e21b5e5703169701bfd1ed50f476c75db743bb6d9e2c0463c27e1757d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS uploads or disposable domains. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs suggests an attempt to redirect users to malicious content or phishing sites. No scripts were extracted, but the overall structure points to a social engineering lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://proektasis.gr/admin/spaw2/uploads/files/fopomorifunotufifesepega.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f3d30a92452---jusera.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/pjtlnm87fo1lc28gftu085sfm8/farigurilofupowiges.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dc2d62949---49306977060.pdf
    • http://lica-mpt.it/userfiles/files/basubepetonuxaribe.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa6a135021---wuxerokanisu.pdf
    • http://copy2d.com/ftp/image/file/99296221625.pdf
    • http://aviatechinform.ru/sadm_files/58901324527.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/gurup.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/u05qflffr2kuoj56bicbobivm4/miwefusufobepin.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/58bde10971206cc9b5e86dd8cfb52230/80106867297.pdf
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/83216567827.pdf
    • http://dental1970.com/clients/5/52/52cfbc2c58cc98a1938bca6351e90795/File/kulexiv.pdf
    • http://muslimofwestbengal.com/mwb/editor_upload/files/16511843620.pdf
    • https://asthasupermarket.com/userfiles/file/bijabisewimakip.pdf
    • https://equipelec.fr/ckfinder/userfiles/files/votibotulilo.pdf
    • http://hitecds.com/userfiles/file/73510712965.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d71082e533---bojulagoremefuf.pdf
    • https://an-professional.ru/img/files/file/11390543929.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/f2555d2e404b73072a91eb3e5e0985ef/49555806732.pdf
    • http://leaguengn.com/userfiles/file///tuwilubalumo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ways+of+the+world+a+global+history+with+sources+%282nd+edition%29+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_off0000f386.bin
66d798423d7d94d441adc5fc8fb47879ee2a6436973303f2357d7c3088a7e2e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF386 17448 bytes
font_01_sfnt_off000120e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120E7 16792 bytes
font_02_sfnt_off000138fe.bin
7416b861056f23707af9ba166f51cda3fde0850b7e29bc3d678a1cd12184f8ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x138FE 11608 bytes