Malicious PDF — malware analysis report

Static analysis result for SHA-256 70d29df0a79c3bb3…

MALICIOUS

PDF

77.7 KB Created: 2021-09-04 16:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 44052f8dc460e5184ea0e65adf65ea8b SHA-1: 08674342729d39270637a2e2434001ae3d0c752b SHA-256: 70d29df0a79c3bb3b583f829c71c9000b618c1a6f8cf9f862c18dd0abbecd0a7
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, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised CMS upload storage. The primary attack pattern involves luring users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://vildmarksjagt.dk/userfiles/file/4090572889.pdf In PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/479bfbda1e60f72b7874020070d97a1d/70676446603.pdfIn PDF document text
    • http://mamam.by/upload/File/file/pigukonokivibufanufidu.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/7915154189.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/68544917357.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/xafipufopogomafusodup.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/sidijotizivazemarigusol.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021082922314728.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/708f38c2d3880718ae9f2aa964aad63d/89960629256.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/xogutusizeli.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b09d5fc1506---bofasarusa.pdfIn PDF document text
    • https://actorconseil.com/files/file/32732321550.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/62501355210.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/68eec416dde91639fbd24adde6b74c7b/vatuvijuxurelogasoj.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/o54iefggvukrdjs5uobj10l8gb/72516216562.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/37374307846.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/24693283666.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/77479474179.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/surororogukamexevumibad.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/abee3ac0afece103aa20358de27ddfb3/34282551702.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16116cb5d02a2f---79517474700.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/50987030829.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8502ae6847---fazufudukaxofa.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/6c258b9836e8099bcbee82c782122262/28754873064.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/48d48b3ef497af3ab4be11d3c490cae3/befafaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=hikvision+ip+camera+installation+and+configuration+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_off0000cb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB68 16860 bytes
SHA-256: 9b41dd10ca86628ac1764806f821ead366691973bb973b6e3d3173587fd4e621
font_01_sfnt_off0000f6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FE 11212 bytes
SHA-256: 31cb43cfd6e6518b7b6a40bf4c545b69cad19046bf57a9ba32ad84ffb6c983d6
font_02_sfnt_off00011104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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