Malicious PDF — malware analysis report

Static analysis result for SHA-256 f34d66137a6d6f26…

MALICIOUS

PDF

80.6 KB Created: 2021-08-28 23:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dfe083f598324ee956d840686bc32fae SHA-1: 77acc03799a1cef754a67b98fef485f36e7b6777 SHA-256: f34d66137a6d6f26dbbfd6fef33f12ddc1d8eaa046b51bbac120846c6119a925
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links point towards a tactic of overwhelming the user with choices, all leading to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160805ff15c36d---52336351442.pdf In PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f07461516c8---wuvivapidetaz.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/nuroremavuvifepa.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/41888876044.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/nilik.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e4dd2fe3c---nodunuxad.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/wipizumobuvogujesuludatu.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-8-7/20210807025418453530.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/nidugukoremu.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609835cb1bdfb---67309199895.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/769e5dc7f5a488c227188cfdd9725385/15156205143.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c8a94153d67f0d3a627d833fe87f33d9/pikadofunege.pdfIn PDF document text
    • http://93564497.com/userfiles/sopix.pdfIn PDF document text
    • http://c-amc.com/upload/files/62170450120.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ec5e6a6a1a2afbd8401043dfd9cd0a02/39204988909.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/60978345593.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e278ceaa72f---52782483278.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/nexoguror.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/6646104604.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c89069964---kunaxonativakatasojupuz.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/danabofatigagom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=roland+dr+880+manualPDF 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_off0000d87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87E 16884 bytes
SHA-256: 7b285169937d49a20b9025344112cad241f1b406bb910e5fa2af8fc4cf43b5dc
font_01_sfnt_off00010463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7A 10392 bytes
SHA-256: aec99229b2cb142cfde19f6fb751d15748e82d40aa6d498c1a2fb742e44bdccb