Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1f7214e0627db5…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 02:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d7bd9ba39ce620ed504d04c1a84ba03e SHA-1: cc2d13e04e3000542126faafdba4b6b2c26f8728 SHA-256: df1f7214e0627db52fbf4f8bb7ef907c40b446099051614bc190a2b72db22ac3
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure itself does not contain readable content, but the heuristics strongly suggest it's designed to redirect users to malicious sites.

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://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608624afd59a4---terisokadokanefigefi.pdf In PDF document text
    • http://izeninfo.net/admin/upload/files/90680718425.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbd3cba312---gogabugijeninibudotivavok.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/fifite.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210812024811.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/zevebosu.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/35694433942.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613163060ec5b---pafatubezisipovedi.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/3852288357.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/xepegavuguzikupodefu.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/namisaxeli.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/0c3254fe5ee91623dd1970f2f2ed3e7a/56428471424.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/dheuvaqjktkasrqfbdod1ghh5t/63252296168.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/56675678953.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/fibifen.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/13262554433.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/65250759259.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16093b1ff57ebf---zebojejifutedenazavoda.pdfIn PDF document text
    • http://lelit.nl/app/webroot/files/userfiles/files/66032331648.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838c855f249---pelezumavagurofopanatus.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/8b527cdf851a15e29f897766a8d35cff/zeratolifo.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/ea50413280d11c92604bd1600655f278/fopevapidikerolefopojux.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/67978611781.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/94acc6d8a7d3e9250eaf31933fae1d0e/gakibus.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/tajosikatet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=vw+golf+gti+2015+owners+manualPDF 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_off0000d66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66E 18548 bytes
SHA-256: a0b0ef89e778fcd3333861fb861acd71d506d9ec4442bc33d3a5a37732a1f7f5
font_01_sfnt_off00010739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F50 11140 bytes
SHA-256: 48f22f26330acfd08fb8bcf8cd47b08bd483830dfe7b3acb1b6046f9eadfe5ef

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