Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa2022fc7fe078f…

MALICIOUS

PDF

88.4 KB Created: 2021-09-03 10:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4b4c3388a570bffc8c36e498960968e0 SHA-1: 6c544239d6fef14132cdfbd5d53867a421ab4446 SHA-256: 9fa2022fc7fe078f1cd06743ea87f0d5ca543c617719e5be933821dd43b27bdd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The 'SE_INVOICE_LURE' heuristic further supports the idea that the document is intended to deceive users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://allytemp.ru/uplcv?utm_term=pdf+to+excel+github+uipath PDF link annotation
    • https://ecoolteh.eu/galeria/file/puwirijikerifofuragu.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/s52fgfi8upo50os7bkptvo9ns0/75056046751.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/baburexa.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/3108956726.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/sedotorukusagiv.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/12640147088.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/9920912593.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/78189172400.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/ur5a6a7usrrtj8cv31mepcss47/zetasufojojemetomam.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/52958409133.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bacf59c5399---79225117484.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/73146922799.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55924815803.pdfIn PDF document text
    • https://synersys.fr/contenu/file/82285634254.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210620_D8792F8C734CD0E4.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/v1s3gf68ggv90gdeur04ljok3d/81416897010.pdfIn PDF document text
    • https://andrejc.si/files/file/weruwejixolelidoxisatiz.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/49624513637.pdfIn PDF document text
    • https://mollis.rs//files/26480213927.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/dunolamutafatexenul.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/59818130852.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/51541840274.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/1bb9c7d5e153176c6b6bc7dafffb8552/40213158461.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/72685992425.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_off0000f233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4A 10872 bytes
SHA-256: fd8c6f131c075e4e1497499afa2f9dfafc85ed22dd102013df13d85725798dee
font_02_sfnt_off0001231a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231A 18768 bytes
SHA-256: 8f9f81a975f2cd040b78310448d22d0f3c30706315276fdaeef079f76989f3fa

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