Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3a212c54ab361a…

MALICIOUS

PDF

79.1 KB Created: 2021-09-02 06:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 140d3c313bf6e97b8ef9861d6ccccac9 SHA-1: 3742a45e6931bd8485e740b8327e1ea33a749867 SHA-256: 9f3a212c54ab361ad424e4c226eda945a5a9656dad10e82b1cdda3bca9ff649a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised WordPress sites. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c026e3ccc7---kimewaje.pdf In PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fe6bea8b254---49473590845.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa1969f708---duxeniguvite.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/2d88dd289f4c769ff03f274b19539527/nawugiwipid.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda60bcab62---tajugotevi.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/fudutakuliwibibubanuse.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/zalez.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9187b6b62ca442e7b83eb95d5aec1c77/xokekamun.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/peluxani.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/lemafetedopitutako.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/lujus.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee40121357---59965018761.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/45670666289.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/kawezunutokewupi.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/magifesafazuzife.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e3a72fb11---woneguduninubaj.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117bb6aa6cad---38466099174.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/8415106257.pdfIn PDF document text
    • http://billsky.ee/files/file/23029798989.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/18681393128.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/31199951417.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/rakokimivopatomuvana.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096710fe7fbf---tadupurebopewufod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=maximum+state+and+local+tax+deductionPDF 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_off0000d0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CB 17072 bytes
SHA-256: 54df9a2a8d174a003efcf8405b117c17ae2694ce9a38912d69534135380433a0
font_01_sfnt_off0000fd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD12 10628 bytes
SHA-256: c743e3da83cadf1879a6bf1405dc7c169af62f001dfa003f4d992aade3fe38e6
font_02_sfnt_off00011569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11569 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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