Malicious PDF — malware analysis report

Static analysis result for SHA-256 66965296c164df2c…

MALICIOUS

PDF

84.6 KB Created: 2021-07-19 20:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 39a2218555acd05178e87406419da9bb SHA-1: 3b4f7fee62161d9f27008b1cb2fc9ec86c8dd116 SHA-256: 66965296c164df2cb664835680d0b456fcd3336ded26ef2ebaf07f45958b5ac0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to lure users to potentially malicious destinations. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing trojan. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the true destination and potentially track user engagement with the phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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
  • 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://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/ishkbnc3qfoi0anomsutdu7lj0/88826842913.pdf In PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/balosukuga.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/01ab9279ebb4f1ccbc5e117021e13372/tutujekakimepakedukiseru.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/51805402543.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f0ed2cae2---40286526522.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/mgr5skfnh8sludn17c5mtlcc2v/wegixipesewo.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61e84b71d4---63773579527.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/cd071586dfbce986380051383543b12c/lumiworuwa.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/28931753163.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/afb8716928bb171532dfaaf0fe1d2ad7/nadure.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e3d58a28b---54029830815.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/xafepufewatomixaweras.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160894ee04323c---22266955211.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210522235559.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/76a3560d110167635afffb0a6132b15d/xumomijejexipuxu.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/48686185017.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/735c72e7290c99569487c7d13cf2fa45/mexabal.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ehni276s9903sfl3jqpg2ue243/646311400.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/keralevigakemenoruravudo.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/d422aa7fc26e74b7eb6e5d43b177727f/pigasovukijapiwanibududo.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/5oljt5l88mkbsfbgldodjfgq5u/12551903788.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/pesavas.pdfIn PDF document text
    • http://candientuvibra.com/images/file/popuwulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=wind+force+11PDF 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_off0000e9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 10040 bytes
SHA-256: 17f07934a793f300abae80c09242284c705f6ae0f54eab00f2c8ad863894d744
font_01_sfnt_off00010027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11839 16856 bytes
SHA-256: 386615833f7676912eba8f8ce7336d263e3cde452b46b8991ab0971f523f1250

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