Malicious PDF — malware analysis report

Static analysis result for SHA-256 305f0fa18f39b6bd…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 12:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8a8b7000e03c6e710511ebb1141381ea SHA-1: fc199d9c6a021764bfd2c3212e181d5210d53b81 SHA-256: 305f0fa18f39b6bdb0cab4aa7636a027bedffbcf1fe7f2c410c14a20560f7544
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to a link farm hosted on compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://medvor.ru/uplcv?utm_term=aston+martin+vantage+manual+for+sale PDF link annotation
    • https://0286869143.com/editor_images/files/lugokiguzejixogirikifigur.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/zozabadulijubapokojonini.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/pogitubuvuxobafebagadulu.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/9fb73cd42548c372af78023a191c0b3a/taxez.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba49edbf35---musonifenofukezomojop.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/12968351466.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4171fbfcee---76029881177.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/61984444515.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/28520939379.pdfIn PDF document text
    • http://teplospectr.ru/images/files/51838207333.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9a522dd81---nanakotusisa.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents//files/fufubikud.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/42457569810.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/xanunojaxu.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/11f6d4589d9bb774537c9e47184646f1/86634013419.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/68679107802.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ade5fc2b65e6a62fae6af8f12ee0f5ad/mefukawimunavilofef.pdfIn PDF document text
    • http://landia-print.com/pdir/file/zujibevulugudutusevoze.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160beab04e3cf2---sigariwu.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/56028363097.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/domibawodovaxezemexen.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4a52a32a9aa00b90ffcc913bb1a7f9f1/dafonajedopapimevuk.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/66427ae8afb7646b12d99b26a68a9551/dakunirimotigujomepo.pdfIn PDF document text
    • 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_off0000daee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF305 10704 bytes
SHA-256: fed424462e4d9ee7160168dcac08bbaa50f1867755e57020c8f36223c6a36f7d
font_02_sfnt_off00010ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA0 18004 bytes
SHA-256: be62532e0a3cebe6820a656e084064a216125d71f207ee30a68d69a02c04322c

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