Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1227511523b3d6…

MALICIOUS

PDF

236.9 KB Created: 2021-07-04 08:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: aa3aedbf7a892460aea588df55403493 SHA-1: 2370662ad1f7ce2e0275c30b361be6e418505c6c SHA-256: 4c1227511523b3d6da6ee0ef3eb3e285cda655e6908750d14c35f277ad496be4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links pointing to compromised WordPress upload storage and SEO redirectors, indicating a phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a phishing payload or exploit. No scripts were extracted, but the presence of multiple external links and the nature of the heuristics point to a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

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 https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/aahngkbmt13oipf9kggrj94cvt/44513861919.pdf In PDF document text
    • https://migger.dk/userimages/file/15933059223.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/42db3efafcff5bae60877b116832a273/68267464876.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/56809804740.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c192882e4f8---72007527743.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/59930706715.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/v0tv9mgisms98c6almdrlgvnh3/76782126352.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/xadeg.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/ddf5953a034c0b9300289f19bcde1742/tuvokepogabojuvopuku.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160869c439e6ec---gisesomusotogedenivopus.pdfIn PDF document text
    • https://bio86.net/fichiers/sapatixaves.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/aff640b6bae78580525466b92ddfc831/98547388580.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b795799c029---badisuvu.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/68507207696.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b84c842d7b8---42012762705.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/wesoreporuxarexusigege.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9039b00f7---66369638438.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/9e3d0336afc90fc166de33abcd745d63/43133615432.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/v627qh8r49f2q95c576p2v3740/64397684990.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/71e6f73c0f0a228d2da7e5a18afed16d/27252882247.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/81a6bk22u7aa3u0skgcel6ch10/busaxuzafe.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/34897220031.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/82b46f15dd0a3512bf246c6bfe7fe67c/wasonibu.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/82668916507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=clash+of+clans+builder+base+update+2020PDF 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_off00034396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00035bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35BAD 11228 bytes
SHA-256: a98219e1c30e6fc45a07b87d4bf0bac02ee3be85e4577fbc105d54773d4f4946
font_02_sfnt_off000375bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x375BB 18300 bytes
SHA-256: dc7c8ba6ffa3cb1e144306f0c3f7e971c2003855bf3e62db2be054b433f38b3f