Malicious PDF — malware analysis report

Static analysis result for SHA-256 929e04fc21c69324…

MALICIOUS

PDF

87.2 KB Created: 2021-07-18 00:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 15a342936a0b10d6c79290e33cab6726 SHA-1: f3e6f99b03fb1e54541f3caf55922717a3c5b969 SHA-256: 929e04fc21c693243c04879e7368d678804e6816fe5bcb6ffea68b0e95fb06db
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised WordPress sites, indicating a likely attempt to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution lure. No scripts were extracted, and the document body was unreadable, so the primary evidence comes from the embedded URLs and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • 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.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/9fe678362ae0320e1c96310312e7f986/71677133921.pdf In PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af9e718ec11---pozakatolawedukalapifu.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/24895312186.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba024510be---65503739984.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/41ac2437c63436e0cee2fedd670eff6e/xivotisokawuvatemumes.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/3397083073.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160989e7ee5b6c---lenexupoxajuroji.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/55138239883.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160762e35d1380---dukexuwevarab.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/nobolabemovuvonigi.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094abdcdd3e7---42942627722.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/pilazadunejewa.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85da8336f0---fasadeto.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd220acc92---davijosagakux.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/76236728530.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/75ccfff4443429c81bae190bae5d1550/88929894917.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/93116024929.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/88757598351.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/4353795957.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/14065229004.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e6de46ef5---livoxibalutafapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=example+of+emphasis+in+writingPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10665 10976 bytes
SHA-256: 67cc5dbaa1926e5f184db5e57898510007e847f57edbf4a7417103566778c597
font_02_sfnt_off00011fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBA 17984 bytes
SHA-256: b4d44dad3ffe79ba63df2c63fd87b99fda25268d3c9cb749a281cdb68807393b

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