Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2526cccea009e0…

MALICIOUS

PDF

89.6 KB Created: 2021-06-30 23:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 860c22525aeb0a07d2e5887cc3220d76 SHA-1: 83cf99ef2cf82f360c045de1525e330380b9aff7 SHA-256: fb2526cccea009e0db7947f23808f2c59d46f699c18c1344ada0426992e9cf29
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of multiple links to potentially malicious PDF files hosted on these sites indicates a clear intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/o1msktvbjc63bi099ho1bh0i4o/13901855860.pdf In PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/g20q0hllvo2fs0bf1dub1l6bl9/59428905653.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/uck1oqoglhblhkgkbd2mc328ih/27432504139.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0152203629---bowofakexubixona.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f07da7bd2---44922118842.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/zepere.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a320829229f---vibawuwiravazumaxab.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/cbba227cb0050ccf091a604d37f9aa84/68299629007.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/1562b3107fa6c3070ed564c8aa33bff1/fowip.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/sulurox.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160790c52c7de5---135035458.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ccaf8012d---94494531042.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/vfc3b25s6g9ffrkbp8bn8ektq7/86223584265.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/58160620267.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/61613b767a0ac70c46db0d2d94ea4b06/94001074056.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d3b561823---87158387271.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d787aa6806---gitikilolegefitobiwesib.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/959238424f1493ad52e29923de4263d5/guwulofojilixogub.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2ea01a0aa---18487924037.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/k93lcvibr4ab96fatclln75mqr/sivamubeg.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/02e687ae6f1b878a70234241dbd7489e/bimobigalegewodufabunas.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/sinake.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6aa03466d0d88f62deacbf0b0f3c4a0a/josajinorixufez.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607594eaa163a---labidonuxu.pdfPDF link annotation
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=real+numbers+class+10+test+pdfPDF 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_off0000f579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF579 18320 bytes
SHA-256: b5e70b20c233f5fbdf85a9f2563c0fe9d8158d777e67ce51d73842c583fcafcf
font_01_sfnt_off00012623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12623 11028 bytes
SHA-256: 82a06038b97533249d52e8c44b1cc49f0e8eed1d0db6bb8121be8bb0ac1c5b56
font_02_sfnt_off00013f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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