Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5fd61d9512b95e2…

MALICIOUS

PDF

88.0 KB Created: 2021-09-05 06:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7a8f5be032718d78868a1ed43e012d6 SHA-1: 6ae8eb33c1282db2aafc15e5cd275d277eedaae6 SHA-256: a5fd61d9512b95e2e166312e2f40b2c4cddd89d23c4d8f33648ec9a6dfcd202f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm heuristics strongly suggests the document's purpose is to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=ladrona+de+libros+resumen+pdf
    • http://boracayg.com/FileData/ckfinder/files/20210827_403778AC08530AB7.pdf
    • http://laconchigliacasevacanze.it/userfiles/files/806034458.pdf
    • http://sushikyototogo.com/uploads/files/22316102834.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16071e5477ddea---kujakepasotixutejotaf.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613426c28a84a---rusewatus.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/40430853467.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/mnqs0lplrpf3oc3mf2ets89alj/6336743800.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c6df35f25---18081390131.pdf
    • http://centronegozi.com/public/fonujibapugasobuvuso.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/701f85375b610637def942918188f712/28851247057.pdf
    • https://oteaexpert.fr/cite_imgs/file/fizevodozusavatovanumu.pdf
    • https://serviceservice.eu/userfiles/file/57100599207.pdf
    • https://edcasys.com/ci/userfiles/files/71832725898.pdf
    • http://bukharajohnscreek.com/sites/default/files/file/detudel.pdf
    • http://amadpich.com/userfiles/file/soraz.pdf
    • http://cs-web-design.de/ablage/userfiles/files/kokepirowaverutegivab.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/61746ea14ade355cd797a6f3d3e1639c/kexatipolojidujo.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd77b121fa7---vexevu.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607868be5ae10---fitokepuvur.pdf
    • http://veterinariacasettamattei.it/userfiles/files/kinorereralugeresi.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/o1ehpeg2rcmefj3pim9jotutmh/sowusosulabibipowevax.pdf
    • http://skyline1968.com/clients/74864/File/6897688479.pdf
    • http://pk.mo/userfiles/file/54106926451.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/an7ch4j4hvr8kgc799ol8cske5/405776188.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f0077f236e1---bimazutidememu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee24.bin
fbe1db4ccc690ff19b7b7efbd61ff4c5051b900b99393d73dded9841b4e1f1bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 10756 bytes
font_01_sfnt_off00010680.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10680 16792 bytes
font_02_sfnt_off00011e92.bin
5ba3eff0a29dbfea554cf2889b748c350bb8786d5da4858053e71ba89253fcb3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E92 19532 bytes