Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa806464df6634e1…

MALICIOUS

PDF

82.9 KB Created: 2021-08-31 22:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4763499ef96a5c33f00b68ea46a2431e SHA-1: 8a549c40392c371516a6f209921a813cb573e83e SHA-256: fa806464df6634e17a9d6ca0baad12620fea00a7522f491b44a032efd0c55252
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous external URIs and the nature of the detected heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bestcoloringpages.com/userfiles/file/8319398934.pdf In PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/8svkrk4alul305vd5c1fsn6qu1/gelarito.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/5110392923.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f05fb95589---38966860274.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/59766616161.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/gopewotemoganazigobozobi.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/37834732648.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/vatabajosujitakoz.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/folitunupubakajemugekin.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118755d8a13c---54824143073.pdfIn PDF document text
    • https://premium-house.uz/images/file/zejimatunamawaketaluvuz.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/42851546414.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/tukemeka.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/gumisemedoxivuvulibu.pdfIn PDF document text
    • https://dm288.rs/slicice/file/57254361164.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/3pa3fgs00nt3tfmiaajgd385v2/luwopikewigoxa.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/c02jeti8p1s1mjkaruhmjv73ru/79693949590.pdfIn PDF document text
    • http://fxmeat.com/upload/file/eaa2f910271e466e63e58f6b979d019d.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/88732770447.pdfIn PDF document text
    • https://carlojans.com/cms/file/17341589381.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/92884183648.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/tikatem.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/39468476840.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=god+of+war+1+ppsspp+iso+free+downloadPDF 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_off0000df46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF758 17692 bytes
SHA-256: 68912a467bb7ce04725c68b39a0da5d8d62fb4235380b1c6ad39a5a9d4e84b89
font_02_sfnt_off00012540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12540 10572 bytes
SHA-256: 600707da2e0cf818566de4d70181706df05995009123ee92debf72882708ce6b