Malicious PDF — malware analysis report

Static analysis result for SHA-256 c296d1b6ec86b007…

MALICIOUS

PDF

493.9 KB Created: 2021-06-27 07:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3cf83b6230f97dd0c47e1d0b7e59e5bf SHA-1: 408d8951379707949760b5b91a18ab5d1083c95f SHA-256: c296d1b6ec86b007ea3946e409b09704036b53220acd445bc6e2dc98ee949254
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple high-severity heuristics indicating it is a phishing lure, utilizing SEO redirectors and pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were explicitly extracted, the embedded URLs suggest a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8049

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
  • 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://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080592d0b023---rezobedugavemakeg.pdf In PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/wuwexi.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/fepatuwafugugunojusa.pdfIn PDF document text
    • https://fallsplat.se/file/6030457458.pdfIn PDF document text
    • http://rld-carbon.ru/file/49929112603.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/v7gdmhqkg1g0eokno19n0qbodf/31282260168.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/defadibuxije.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e10335d78d---97301190556.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/187509b063376e0fefe46fe54ca1be2d/gitaburuvololajusilekabik.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/53688241361.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/dodopamirutu.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9427a0b720---56834921169.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a39ab1cfd5---83705360120.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/4875605c8bd8933b7372865594e3c401/xedigut.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/68582052908.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/eee8cfd6358572715e06aded5ea9d94d/maxakavafemerasometisan.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a305e317d9c---sabatoruradufinuwowalig.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607559b07d502---xudowuniwagafiwino.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/5111767233.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/724badc198af14757d952849df594da4/repawurajofegunexap.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b61408afd---98116956845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=clyde%27s+willow+creekPDF 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_off0007494a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7494A 10356 bytes
SHA-256: 81b2897cd435ba13c6b6a226dfc6dcdfa83f51512b2f8294c433b985dd4c9bd1
font_01_sfnt_off000760e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x760E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000778f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x778F7 18024 bytes
SHA-256: 9ac114bc1fb1c0529b2935b1020bd0858b0f287cc0b0ee4047572c6dc54c5b67

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