Malicious PDF — malware analysis report

Static analysis result for SHA-256 444fa18ecc09ff74…

MALICIOUS

PDF

86.5 KB Created: 2021-08-14 03:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b0f982b1a1886dd210290c8f465d8bb6 SHA-1: 982b5cad260357e72fd2b2aaa1531de89e589918 SHA-256: 444fa18ecc09ff749461262cd6bbdedcc946600352cfef0b3b57bc6a904ac01c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, hosting numerous PDF files on compromised websites, which is a common technique for SEO manipulation or to obscure malicious content. While no scripts were extracted, the presence of multiple external URIs and the overall structure suggest it is part of a larger phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d9e15d6e9---44924181300.pdf In PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/5668155872.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c9768e8e9---30525820335.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-16/20210516223433515931.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/86973637042.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/0c2ei5n2ls8u3qvqe5c4hpteu0/remibewebobizu.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/8c77fc7e97962559c96e6127359175ae/61560150356.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/29951750745.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c950d100ce---ruriribuvumelimagufu.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/runamemiregilemexabe.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/vupuwegunakoziru.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160733376ec335---gifufozivesilutopizug.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091420dd5c40---logewexanesibonijeramubu.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/kovalolupuvaxajesin.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3ba107599---bovomalodevenero.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/haao46hlto2adhqc8n1mie5j56/daxejof.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/33123771794.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/fodebukamulimiwitiro.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/bagiluxunine.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/38504379513.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/158ddd6e32a82aa31860333a4074d09f/99094943933.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/29253097326.pdfIn PDF document text
    • http://tele-video.ru/upload/files/kagapixo.pdfIn PDF document text
    • http://kfbi.ru/content/file/zeziteme.pdfIn PDF document text
    • http://bdn10.cz/files/file/vipikaketedogofufirukara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ozark+trail+instant+canopy+setupPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07B 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_01_sfnt_off0000e883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001009a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009A 10760 bytes
SHA-256: 1214464235b8e79b277fb8a3d0b5f1a359237fa5246797fcd21cb18e0ab8e0c0
font_03_sfnt_off0001199e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199E 18596 bytes
SHA-256: 13a0bea3ae9ac8524c7cba471c05bf6c0aaef3af9f6433ad7c068abb913f457b

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