Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ced50f83157fcc…

MALICIOUS

PDF

62.5 KB Created: 2021-05-11 11:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1e50cb694da218a7c50f27490dfcd30 SHA-1: 80770ba9232c0bb2e79cf01bc80a80fe3016981b SHA-256: 72ced50f83157fcc1f7e373eba58356f53945d338d24ab2e1df493bd3095847c
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly suggest an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://allytemp.ru/uplcv?utm_term=appointment+letter+format
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/6c7f4c3f883ae2335118bd15c38c411c/90903813316.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7737730c0---xozijanufatuv.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/tpd07rpqvthpo6vufk75srr1eh/mudoxuvugijimiretikaza.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1608167b79e051---82591592035.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/3ed7612c7f84c476394e8d46dfc7b8c7/givoxunal.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/sepadexiduwolawezup.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf87a2112---betukoduragukijunoses.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160714a763fac3---30767203883.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b6360c3f1---19796386441.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/21546952452.pdf
    • http://anhuifan.com/upload_fck/file/2021-4-29/20210429010734775764.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/6c3c149bd3f11558bd14548afcb29a49/48182631274.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160965ddbde2b2---xozopuxa.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d042ecf99---zuwikaxobe.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/5oies7amgucg46uvi6r8gbnvbf/56369325684.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/12e9547dfff11b234246dad41800ad9e/76010840251.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de9c.bin
6bb96b5811784e419c93031987079fc55622bd7bf31f0c50d21734d58974801a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9C 4860 bytes

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