Malicious PDF — malware analysis report

Static analysis result for SHA-256 71135d97e8d14985…

MALICIOUS

PDF

118.7 KB Created: 2021-07-14 08:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ef3be34bee1776ea3f9ab9791636373 SHA-1: 9ee66724ca61711b0d65efd5b39ef2d6f7f042f8 SHA-256: 71135d97e8d149852751fb0561ec04ff350e02bf8d980f14c6ef7df206fef81a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised CMS upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bac18b230---sesugeguwoxutipize.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/480b512957d6da24ef460999fb4f74dc/nonasewidilewemebopijuj.pdf
    • https://apz-arte.com/ckfinder/userfiles/files/zulifixigawiwubuvam.pdf
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/84384802785.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/3utpel8gbaes9eb4q770ksbf25/nuvevadebonegexufa.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160802f0ee9714---lupopod.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/4n3g194egk9na67b7dvtbt7baf/268062693.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bc634fecac0---24874248029.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/538ce5005c65f33649f61e3679be4e26/29996287263.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ffb40343e---javuwagup.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/gh26bu4aofpdbd9g4kafnoar74/6533091752.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608abbffdc5c3---86739057534.pdf
    • https://narimasu-chintai.net/jcfiles/file/22582805525.pdf
    • http://drsuthichai.com/userfiles/files/judijipa.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/l5f1hp2meu7r2l9jbuc6nrj160/gefapobuxugazit.pdf
    • http://archerelectricsupply.com/userfiles/file/jonuvoxakavus.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/274aaf03ce7300b0ca9dfa4c12342153/notetudeberasejisoxige.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7d390d0bd---24059192552.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad04af18903---18258000166.pdf
    • http://medica-eg.com/userfiles/file/selutitesefinate.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/270a6fbc370f2caad2c1a7d631a76a45/rujepidalaselesi.pdf
    • http://ahchala.com/img/file/68365873917.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f6c9d614d---dunatosexiwawonixejos.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+weaver+divinity+2
    • 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_off00016e9a.bin
43534717cd4276d5fa91ad67778911255e904b7ae19e05a872d364142f825572		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16E9A 10360 bytes
font_01_sfnt_off0001860d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1860D 16792 bytes
font_02_sfnt_off00019e1f.bin
d0d8c0828748a7497001b1ba50097bb72d25031cfa4b300db9b482c7f41fb690		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19E1F 17880 bytes

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