Malicious PDF — malware analysis report

Static analysis result for SHA-256 49cb23b320789afb…

MALICIOUS

PDF

95.8 KB Created: 2021-07-13 15:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1baf8eb89639bf0fdbeba7899dd29ddf SHA-1: 44035423ba338c2afa4edd151a57ed6941b3da46 SHA-256: 49cb23b320789afb977db4289f34f5894b8c770ce2571f8fe711171a98c3f9be
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The file functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and disposable hosting. These links likely serve to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/3c7cda661495edc8c08293339145bb73/kikekisolugivopuvet.pdf In PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef46a27ed9---33196272731.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/49453102184.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e69464afd6b---daxogeranofexiveni.pdfIn PDF document text
    • http://auldskoolrocks.com/clients/878384/File/4237546585.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/83588930035.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607362bc00a4e---dedolalijepevunasetole.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/a4ce4168124b1af31ac55df2ff8fdbe6/xilemoxat.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/74153850657.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7eca79198---5510692086.pdfIn PDF document text
    • http://artside.org/data/temp/file/xatuguwamurebopupoxe.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/5fb526ffa0202b9a7d6871c21d3d2e86/87322887289.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d74da973a---xosotidonelevimulesij.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ada8e54a9b6---girilami.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160c41595ec4ea---gakuxuzukarefabanumumu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c242258b7feaa2c47e692551d923d442/kogilewebizoniruzogez.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/2042305af61351a803c895e636e1af02/loluwapevezezojomejax.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e130a57df---fozimusorupakuxiwux.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa3cdbe0d5---bijawifaxapabojezuleroki.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/53679575733.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089b933bc82e---75876886818.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4bf0be23a884226181f9c30288f09d7d/talinebubupodomiv.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/wezax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=snakes+of+india+book+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11429 17744 bytes
SHA-256: 14bbf046123722e3bb781f870603107fdacb7d6dceb95cd0ff5017b668a9848a
font_01_sfnt_off00014216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A2D 10556 bytes
SHA-256: 8c7ca40f5f74be003769c3f03bf1f213c2e273e509e79b70efc73db17638fab5

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