Malicious PDF — malware analysis report

Static analysis result for SHA-256 249532c68329fbe7…

MALICIOUS

PDF

89.4 KB Created: 2021-09-01 06:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6e0474cb48fd1404811f5cc71e8bd2e0 SHA-1: 4ff807bb897c8cd09b8f9bcebd4ee8c2e9e27c32 SHA-256: 249532c68329fbe72d71266fa5e7a0b3278c5575ef07dd7c9b997e60b6a1071d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially compromised CMS upload directories, suggesting it's part of a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers strongly indicate malicious intent, classifying it as a phishing trojan. The document's structure and the nature of the URLs suggest an attempt to lure victims to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://manuale.aziendasulweb.it/userfiles/files/zameraw.pdf In PDF document text
    • http://bsbcarpet.com/userfiles/file/25463222695.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f25cc05804---dovorulameruxeg.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/161081a6918a95---33768364350.pdfIn PDF document text
    • http://vlajamo.cz/images/file/talakupuke.pdfIn PDF document text
    • https://maymac.info/userfiles/file/rizesapude.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/sojowumapixi.pdfIn PDF document text
    • http://sherylrobphotos.com/clients/56056/File/fitis.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/supuxeripuzupurivoligon.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16105ddf4b703f---xasusuvudadupomuzuzoguna.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca64d967be---68041713282.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/diborozowo.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/gepigijowetulemuxejubogal.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e76ca80b3f7---vivujakaw.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/97020243130.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/13380758358.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c574c0ad42c---3489370066.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/j485qh7akii2ajq4dhqm6pno53/sorumewesuzezomelevi.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/teganojizenijesidusibe.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/66822889574.pdfIn PDF document text
    • https://avela.md/userfiles/file/4650785555.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/lavafofiburugepoxufedoz.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbce709974---gugelorijowexiwugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+unbearable+lightness+of+being+frenchPDF 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_off0000f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 20120 bytes
SHA-256: ea783729938d5a23e3a34e49586f0f73e96c4f5ed96271975c602e8621b5dbea
font_01_sfnt_off000125d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEA 10820 bytes
SHA-256: ca15dc857d15aa0c9fac6b12b36ee6844a0930703ca6cb8dd731090fd543d51a

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