Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee76937aff5ec74d…

MALICIOUS

PDF

81.6 KB Created: 2021-08-26 05:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 637425feb9f4181c419a731e5f864e8d SHA-1: e7ea451a3a18adae6c802b1178e59ffe9b51c9e7 SHA-256: ee76937aff5ec74d3d375af60de3df5ad89562a04271303b3c7266492698cf8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, distributing links across numerous domains, many of which appear to be compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, serving as a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/198d3d797005c160146cd87a316a00bb/23317172453.pdf In PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8c217648d1e621c9d5d1709ac856157/33089814094.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/23116443364.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210621192434.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021080807020872.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7819aa4a9---60220831380.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/8713490501.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/towof.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/vufiz.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/legirizulevamiwunar.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/97395169211.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/vanuloxesojowisufa.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160906788bc3da---1716391664.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/8da5975c4248974547148b8939e32c27/tujinevojakazeb.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/43146054851.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/fereb.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/59087086816.pdfIn PDF document text
    • http://rongqichem.com/upload/files/zoxotikowa.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/mekodumunamurakewe.pdfIn PDF document text
    • http://npas.ru/pic/file/notarunulilazerepirobi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f94d02cde6---posoxujuva.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/28c7452575c6fed4de24c6f0546f654f/lagoraxolabakelekojefot.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/devivogoxefin.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/sujajazonosibinigorejida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=laplace+fairy+guidePDF 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_off0000dcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD4 16988 bytes
SHA-256: cc3f237741331e8da816c98ed595aef6b55b73f6513f120c0be2092c0b2345a6
font_01_sfnt_off000108dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DC 10476 bytes
SHA-256: d76bf8c29df7517e1cf562a06e074e8e3f231e296fb1d67703d4a57c2328d7f2
font_02_sfnt_off00012092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12092 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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