Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d9a9d591174c43…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 20:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3091a0a2df0a1cd3b2bb8912209da672 SHA-1: dd812d92743c550ddc4c9759734c1b5d1679ddd9 SHA-256: 71d9a9d591174c4379cfd2a61b1867488086286202066f91c5b41ea852d443c8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/5391ec642a57eb9608e25538e700b78c/mokidixaginufagituke.pdf In PDF document text
    • https://b2cexpressdemo.com/userfiles/file/sebajel.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/maxidiwaxepojuba.pdfIn PDF document text
    • https://chp-travel.ir/data/file/17121336901.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/83616355163.pdfIn PDF document text
    • http://szpk.hu/_user/file/gilamevetabetivujozow.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118d01dc0b35---gexonamalovijikawapiv.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/vususezawajegotejakuse.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/52743672771.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/25429278767.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/41356365695.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202108290814007724.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/70473228804.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161068941f0603---32246725325.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/48771627517.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202108211830491385.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f393489f7c5---63485518646.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/33431628781.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/satixajunek.pdfIn PDF document text
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/92463969329.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/agucj14trn9nal9of0rmo5kmr1/gejajudugatikojozus.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/relewovaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=gestion+de+riesgos+de+proyectos+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FC 10740 bytes
SHA-256: 2c2ef7ff4a164a364d5d869b0a6582f59689cea5bfb6d5e91a47c6b1a1e80a43
font_01_sfnt_off0000f0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A2 20412 bytes
SHA-256: 2905ebc4c6b9de21105d7ebea41109767e1f82f62419b458570f720b831eedfa
font_02_sfnt_off0001238c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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