Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f66048c1a9e642…

MALICIOUS

PDF

87.1 KB Created: 2021-07-17 03:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: acad2112d8ebc04cbcd502d48b1c41f5 SHA-1: a75e00eaa742a6831a38e538e4b5bedba5431aa6 SHA-256: b1f66048c1a9e64276fd2affa3d6882758f31c357641bf8a984b835391e97c61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or engage in phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL distribution are indicative of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://dochoiotovn.com/uploads/userfiles/file/12407434807.pdf
    • https://protradingindia.net/userfiles/file/mifatopoxegikatipetu.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/sog2iqrs5kk9mqv5vtbqrsgprm/xezavefonuxujewiw.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a171beebbc7---73638786961.pdf
    • http://edbiji.com/uploads/files/20210707200030_122790.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160731d28cc7cf---vixezasebiduvugiwanotife.pdf
    • http://fedime.org/imagenes/wodutoroxefonig.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/csccdoorj79vd3bgg9ct4vekn7/9421804782.pdf
    • http://bscartridge.com/pic/82357547936.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c13b46c481---5943400564.pdf
    • http://andlupa.com/userfiles/file/97489931055.pdf
    • http://aftckwt.com/uploads/file/vikukojoravevijufarorejo.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/b10ec7307af07231735b3d7e6cd823c2/weworedawaro.pdf
    • http://zovsh.com/Uploadfiles/files/susuvamax.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3af55452ca---totududolotipevejegifib.pdf
    • https://tckontrola.hr/files/bekikodunifutodafenamaga.pdf
    • http://angelcabrera.com/FCKfiles/file/kabejagilaruxemonasa.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16086dd640e8aa---16376254711.pdf
    • https://widepolymers.com/userfiles/file/14759857570.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ku31c8ktf1g4iges6tejab73g8/vopuzanuduk.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160847be17dce0---79315931213.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d71926e3100fb7b9cc79133270cd61d4/xovekekukumitamat.pdf
    • http://resetimpianti.it/reset/public/file/kulinujuwuvixogi.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/94656236407.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/43faabe1d4f9f215a16252f153b8ef3c/lolukosotefoxadesepete.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d0e4215b0---xodikosakudepevop.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=physics+questions+and+solutions+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_off0000e9f4.bin
63d95062b1a1b955a37cbf8d99a28cc632adc4706aa817288b58fef06c788c2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F4 10976 bytes
font_01_sfnt_off00010336.bin
0edd1eb77fcdd49276ccef34df587d0e83748168c6fd4038aa12d565d85c166d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10336 19876 bytes
font_02_sfnt_off00013698.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13698 16792 bytes