Malicious PDF — malware analysis report

Static analysis result for SHA-256 55abf7d8aa443d30…

MALICIOUS

PDF

82.9 KB Created: 2021-09-22 12:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: afbffc843382ff24d7d713ca6dc38e3d SHA-1: b0f0653cbcf3c5536bd9616568459b3d87bf60c8 SHA-256: 55abf7d8aa443d3008aacbbbd36240910f4132eaf6666b58a1826769ad60492c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a ClamAV signature and an ML classifier. It contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or scam lure. The PDF structure and embedded content indicate it is designed to redirect users to malicious websites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://pistant.ru/uplcv?utm_term=watch+golf+on+firestick PDF link annotation
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613714ff0abd9---vomajebuzije.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/46280206297.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/vakenurewoxoxuriluvinawu.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/fitot.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/52555458583.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/dilida.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/newegezuladifekowetalafu.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/gobifibaga.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/jowegogak.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/deperovega.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446cb7e6388---26173222010.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/46229975846.pdfIn PDF document text
    • http://tai-group.com/upload/files/41963183146.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/29685505246.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/dizofogomakotaza.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/midibagelasasinena.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/loxuno.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0f7b097e0---dujew.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/puferefagoduk.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/legipexusubi.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dee9380c1f---88710762122.pdfIn PDF document text
    • http://abwva.com/uploads/files/48031179625.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161413c82eee73---17293702440.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/boxuloma.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/15579650120.pdfIn PDF document text
    • 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_off0000dd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 18180 bytes
SHA-256: b038c37af472867493e4ba3b73af8206392409bfc08339009e250138bfbdb52d
font_01_sfnt_off00010cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12505 10700 bytes
SHA-256: 6078617696ce32a44c689146de4e064bcf2ef35f901b655716331a21d4b4ab9f

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