Malicious PDF — malware analysis report

Static analysis result for SHA-256 df35b265fc3fec0d…

MALICIOUS

PDF

82.3 KB Created: 2021-06-26 11:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ddccd91733a46e9e67e643a771646b73 SHA-1: 5b0834a738c4d1c25b0f987b225f01ba01522374 SHA-256: df35b265fc3fec0d260eded7bf5aaa52fb52d17713b6b13c4db1ce73aebce8b9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The presence of multiple distinct hosts and a high number of links per host indicates a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609785e849892---buvigofezazusujivodux.pdf In PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/d98a66fcaa76e911ccaadf089827dc73/muferagakikobigazokake.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160717d2c9b0b3---gibepowakepavuwi.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ldp09bab6ns534eki48re60r51/81325298399.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/ef2db2586b176598f0e2c53b546b1094/mudelipirir.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608413fedd03b---gideliromibazume.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cf64371d3---pinop.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/i2dplj6unrgloem4k07g899ro7/32718428722.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086acffabc3e---kidurukixinusamigani.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/viwogodobezazilo.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/pafosemimulujuzet.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/wumumuresilajofokowali.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a9462b2109b---90204748021.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/36438657550.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e6f61570f---totofikexetoxodu.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fa10a7cd3---19190534512.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607584d780d1f---68213880357.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/8aa00bd1f1487a8a23f278119cc84706/17917135509.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210612_8F36438355A99888.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/88595374982.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070f8f2241e5---30017928289.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/097fab6e695430292025415eb4bbe4a1/wadegutebusatawolikuradem.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/8015747cb5f3370e77e5d10c5b755002/11186528508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+put+pdf+in+a+word+documentPDF 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_off0000df48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF48 10744 bytes
SHA-256: d251b3501f3407f31fe8ee41739b4aeb5be1f999d17acf49345031c503a56749
font_01_sfnt_off0000f7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11011 16812 bytes
SHA-256: 5ba19bda73a2f721234cba415cb1a59e57317fcfac8a7f6e16a3bfe620fabc91

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