Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c45cc0dfdd66627…

MALICIOUS

PDF

64.0 KB Created: 2021-06-04 22:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e5864df07e9df9104815f31e2b4e72a SHA-1: 558469968e490eef7d87d2f55851e7ed2771b5c6 SHA-256: 1c45cc0dfdd66627b2640ac690c8c1104ac56788cc126a1d77137b8b07c1dec4
154 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded document body text, though heavily obfuscated, contains keywords related to free downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • 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
  • 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://huntic.ru/uplcv?utm_term=amr+diab+new+album+2021+free+download
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/12736ac63c8d0e30906f737ba6a04dea/19621282815.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/lmshr1ruuf7vo79610olgd2r53/wisotebovati.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/8ud7ih1iuo2plbnkf61jsombud/87844652095.pdf
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/aee2db80e883dd6d193234f018205271/79320401073.pdf
    • http://animalscipublisher.com/files/upfiles/file/mezivuzivopezadeturarini.pdf
    • http://lysfyyy.com/upload/files/91027369564.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/75s56kfiso6farqsiv7ks9lp8g/77570020236.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077658e3169e---tibekezuvuduxe.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/frqeqm0vubtt1oljjsli4cdaar/5892054488.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160afc04412dae---wewabikomesiw.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/bkid9dcglu563dfsaj8q54cdc3/147693434.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ti3bhkummbvqcp9t93g3jodnl2/silojutejuk.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16070d98ab2efc---tesibetusepijimowujo.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/84728436766.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/c15fcb77e33f07325ca767c08062dee9/fedubiwazumiremunoruzagef.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_off0000cf9b.bin
5d8ae67e7a1d486f432c278d717cdf59c813e4ca6cf95a3a34d66d313ff45204		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9B 5420 bytes
font_01_sfnt_off0000e208.bin
3b2d98454e14fe5f22cf0541ecfde07fe96b165f7bb6d9c22d93758a2f7cf01a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE208 11656 bytes

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