Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aec08c8a40ffe19…

MALICIOUS

PDF

100.9 KB Created: 2021-05-22 02:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c12c52e34206479217a23ca66b1b03f SHA-1: 987e9b153edc3fc8e5b86bff3a4151a0aa454a6f SHA-256: 8aec08c8a40ffe19eeebfaeda381fe0ecf93e7caa26363bc7ec32cee63c328d1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm for phishing or malware distribution. The embedded URLs and the document's structure point towards an attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8870

Heuristics 5

  • 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
  • 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=how+to+file+an+appeal+with+twc
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b3af6a7a7---76379647179.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/86eb3f7888aebf34ae2261e234fb6c37/22362402843.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdf50bd34b---93612828802.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/2a13843a00bf4b2593ba5239954eba45/dukurejubed.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/62a5347e26b5eedde8c4146cc012792e/73833088581.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a69f3a29263---muwewuneveziputoketokur.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607218928f462---50720472808.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/38e84d3ab6bff072ec35648a53a8611f/93619188083.pdf
    • https://hondamienbac.vn/userfiles/file/58527549957.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/cd20771f45e755b0182c7f46b9b16ba1/nedel.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609984169f65a---20669762743.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/88a875f099f7add4d0e40707a9108c20/dumisaturepozose.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f69eb5367653c2fbe2d3f421fa285edc/51026843220.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/971328561d14fc37e21a571ffeab2a82/25426244587.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b55cac9b54---bumudafanaziwalo.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094c81503b38---fafowusewurapasugare.pdf
    • http://www.urbanwaterways.info/files/pafuwoxalejozex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000163dc.bin
8b30cecd30bf56655d271effcba292a467b837e42f383099d355eab58c7feb27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x163DC 4880 bytes
font_01_sfnt_off0001748d.bin
a5a31d4eeacb3ec9181d3b070297b11ed183f82f190f50c4ecff037d985312fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1748D 11128 bytes

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