Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e37533fe80866d8…

MALICIOUS

PDF

95.2 KB Created: 2021-07-06 02:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0207f1d1a8fe5dd84544e832a4da84a SHA-1: 299100b2f9cdb21e103896bcda4d95c97f386c66 SHA-256: 8e37533fe80866d86531f578771780a09317be7ecfc9cbbcb20f6c9d74ad0a20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the final destination. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to exploit vulnerabilities or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/p2ekqrvjr7tupljdernmf7cql5/72500942422.pdf
    • https://floraplant.gr/FCKeditor/userimages/file/16128513066.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/a3te3djhc83kmtl6nioo5rgs8t/9438996223.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/93c65ae8ae096cfa23bc4905779cfa14/46727648528.pdf
    • http://chinazzjx.com/d/files/duseweken.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c0be52e490083e99ea1d9512172ebf37/vixuwusotak.pdf
    • https://baxsporthorses.nl/userfiles/file/dodajupivav.pdf
    • http://chiangmai-clean.com/user_img/files/57111946784.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/fdadf3d664a7576b070654d33e22132f/galalekovizekesexowi.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609459686e0f7---fawojejole.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606eece1b26c2---nupozoxufir.pdf
    • https://eravukappalpalli.com/userfiles/file/68414218801.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbaed57ea4---mitodarijijiriguro.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607266dbacb87---72317847998.pdf
    • https://infoenergie-loire.org/userfiles/file/47534465384.pdf
    • http://roxburyhs1987.com/clients/63080/File/9940917262.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/aa087bbd9c15155f3ad96b6c5d1fc019/41543785358.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d162e76ee9---14610277355.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/1a5ccf22b4267ed34737d925e852c09d/naras.pdf
    • http://ipmarketing.net/userfiles/file/rixom.pdf
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/99455653878.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160889347666cc---getagider.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607827d6afdce---wenokiguvolivotemegivivok.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5d945dgd5mfjj6h0n78dejg7g2/55191954211.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/2f07n9v54vhq2l513mjlq5hlfq/86992273957.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=adjectives+that+start+with+z+to+describe+a+person+positively
    • 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_off000110a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110A7 16792 bytes
font_01_sfnt_off000128b9.bin
ff9241c0ceed100967ac5d7a24dff6f6b6f35865f8e743d72d64d79673446c44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128B9 17180 bytes
font_02_sfnt_off000154de.bin
ec84f9cfe786a1844ab27c36258ee12e90a5301d38e76fbacc2132b8fa11cb75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x154DE 11188 bytes

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