Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f5df9d0ec790f9…

MALICIOUS

PDF

84.9 KB Created: 2021-08-31 07:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 342e38f7ac279f35a43d7def3e6dd55a SHA-1: 191da6f25cae29e528c53cff8791a8ec8ca5db9a SHA-256: 76f5df9d0ec790f90c55caa77edab0550955334516fdeaeaa0cc1fedf04b147f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting, indicative of a link farm designed to obscure malicious destinations. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a024d42e571---juxadumamoxipejowipubul.pdf In PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/25435953326.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/46876899016.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607459881b032---porojinujorevuni.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ulpim0r1ioggdrve0k3lo67jl6/xomolewirim.pdfIn PDF document text
    • http://wrhs1976.com/clients/0/08/080801f2a31a95d446b71e9836a5425d/File/89267335488.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/wavudajatixed.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/no1cvfv7n9e51sqaksplqrkp5b/kowisevudimeluvu.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ead00e9653---meduzupixozilogabiluwete.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/hsmpilpvcp3csqj9hfoin5q63e/82381813442.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/romoxibaxisolewuzowasetob.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/7279ef3c9afbe317208a755757d585e2/rumoloretidorubasafi.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/f08bfaaadc210be59c86b3b03d372a36/39395980285.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/722880f0e28a9241928b4446cb4b45aa/jafibopunodimodep.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/26017006236.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/ravumugefulenirosasapus.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/bemimuwizobapa.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/59419209889.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/suvowekinujonejabe.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/zajufup.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nowopanof.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210707195943.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/norotuji.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f27b6f3212---sukujudalejixep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=standard+deviation+from+interquartile+rangePDF 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_off0000e45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45D 18452 bytes
SHA-256: ea663a4e511324cd344db0648f514981d026758c20208f32a1c49e91e230c365
font_01_sfnt_off00011457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6E 10916 bytes
SHA-256: aaac1db0eea55cd9e4c7668b1246644fc706e1cce18097dc2a37cd0cccbc3b7c

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