Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d545a9736bb5e27…

MALICIOUS

PDF

80.5 KB Created: 2021-10-09 00:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92712b5d5025a517ec4e23960cae2cdd SHA-1: 03bae0ce39f54b87dce01c16b962312461b78cb7 SHA-256: 5d545a9736bb5e272a6b6660c88187b38a6a77e626de4d8ea2a25b3959a765f4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161536eeec6eec---ketape.pdf
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/garapukisodizukarelumev.pdf
    • http://gewidor-gmbh.de/uploads/files/31679729271.pdf
    • https://ahirealty.in/admin/userfiles/files/kutujizidivuluzalirope.pdf
    • https://www.disbel.es/ckfinder/userfiles/files/93378457404.pdf
    • http://maybaobidinhdinh.com/upload/files/nozagirij.pdf
    • http://headrepublic.pl/images/files/50913224044.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/efed85172b4caebfdc94f16379f2b487/zozutewajabavaterufo.pdf
    • http://innospectrum.eu/hirlevel/file/nerarurubigozevofus.pdf
    • http://alnoorcity.com/userfiles/file/wuxisusazejuvusitoxere.pdf
    • http://galeriejacqueselbaz.com/userfiles/file/maxaxemuzipetupuj.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/542b1dae2117b73bfaf88b575af30ced/53071441166.pdf
    • http://fishtech.org/uploads/userfiles/file/file/3572478262.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613a02ce074a5---poveweteduramuwelot.pdf
    • http://thegioixedap.net/upload/files/74491815192.pdf
    • https://msiutilities.net/documents/zubisedafe.pdf
    • http://dalnoboy.org/data/filestorage/upload/files/40951533534.pdf
    • http://opuspointpartner.com/ckfinder/userfiles/files/46349396419.pdf
    • http://enidental.com/userfiles/file/20210916101843.pdf
    • http://technology-mp.it/userfiles/files/wifavageg.pdf
    • https://accuratesearch.com/userfiles/file/powefupozesazojemeg.pdf
    • http://syekp.gr/sites/default/files/file/zatibefigumaboroxe.pdf
    • http://architects-desk.com/uploadsfile/39198289756.pdf
    • https://kaptenhoki.net/contents/files/palideboxegexuf.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=calculate+weighted+average+cost
    • 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_off0000cf02.bin
71d040c6aa7aafaa0b8f044109b4027c1df8f575353288edf3947568f7e62962
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF02 10828 bytes
font_01_sfnt_off0000e808.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE808 16792 bytes
font_02_sfnt_off0001001a.bin
2ee8508ca7243a2e28a8a625e75c8eaf7ab9f5a0c2657ffad3bab7cb834e5ac3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1001A 19780 bytes