Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c471bc191270158…

MALICIOUS

PDF

197.4 KB Created: 2021-07-03 10:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1006f3d76bcc2642bc69351461013830 SHA-1: 51ffe39887182f239d768a0f5ed1187a5f7eacdb SHA-256: 4c471bc191270158b41e3480116244fffba0ba85b523f31758568ff1a068d2f4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common phishing lure, presenting a link that appears to offer a free download. The link points to a compromised CMS upload, specifically a WordPress site, which hosts a malicious PDF. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing payload or further malware. No scripts were extracted, but the PDF structure and embedded URLs suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://amon-syotengai.com/userfiles/file/wobuberabixizunepina.pdf In PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076da9bac99d---77618298234.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16099b5d36082b---sojezesigikoki.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b1e1a3feb---42032866065.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/kisididubi.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f678ce0e4f---21056791594.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/zotodiluvilowaroz.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/lupular.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa1ce0935b---lusivimozolire.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab865c9b9a7---41137756606.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/75ieqjgmd0epbe2n6kp32alal1/64515197270.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082972c956f4---27201912470.pdfIn PDF document text
    • https://mfdesign.hu/files/file/71218835434.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/19161966143.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/8b439e278d1bf77d33d1a3ae974c756c/rerubutilipuwugoka.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e672564561---nepati.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c227e2d2b8---56193670957.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/fuvisetog.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070863ad5dd3---xelopozipugujuriwoxeb.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/zonem.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd55757f74---duwunaxavorewivotoma.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/5b47bdba9488738890557e94baf35391/30387053316.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021062405100970554.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/71164433385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=bereans+acts+17PDF 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_off000297cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x297CC 30796 bytes
SHA-256: a902f009d5878e8606780e7a8673cf29d245548a4b83119ab3925dc00b8c0af1
font_01_sfnt_off0002d8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D8CB 10120 bytes
SHA-256: 44c5e8db6447ca7493bed3961a94b78d6ce4dfd9ce042ecac72f0d8126b10ae1
font_02_sfnt_off0002efaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EFAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1