Malicious PDF — malware analysis report

Static analysis result for SHA-256 46f52cb39b36dc55…

MALICIOUS

PDF

95.1 KB Created: 2021-09-06 05:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 20f52cd8d4e71bcf96a79b89b4251a55 SHA-1: 74022c261c30b0df713aa99906cec819f71de8aa SHA-256: 46f52cb39b36dc55d74edd7e276340fbf1a68c9993a47d762863dc7be78a63c6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, indicating a phishing or spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to external sites for further exploitation or credential harvesting. No scripts were extracted, but the link farm structure is a common tactic for distributing malware or leading users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://ruoumoc.com/upload/files/losiru.pdf In PDF document text
    • http://envigest.cz/upload/file/70570752794.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/4ebdfdbde1910e775da8879a101f75a5/60634226080.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d7b260140---66193868517.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/89299937314.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eca6e68976---96063199932.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fbe9c3123---dozekurogisulisulize.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3fe44e13b---mulorilenenawovenufesuki.pdfIn PDF document text
    • http://orem.mn/uploads/files/rukosazipi.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202107/file/2107280257554034859t5d5d9jmt85.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/34002648219.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/0432710335ff10e7c49ac31c96f6fae6/82537879314.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/fa3b83c587047f369274f21003731576/60574573377.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/vavafegomaxu.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021082119375873499.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/wujoxofefiloluki.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/kanuroje.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/8119321783.pdfIn PDF document text
    • https://tempegaring.com/contents//files/zidixegowoponuxidalope.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/61861592746.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/a928b35b65877763f4bb99a426e93893/ripat.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/7642359533.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16073214a88ac0---64225256351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+codex+seraphinianus+pdf+downloadPDF 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_off00010688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10688 10868 bytes
SHA-256: 94c49ae9f74a01cbd435d28ba4308afdb925bd912a744fffd46c25ef8fe18cbb
font_01_sfnt_off00011fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA2 21308 bytes
SHA-256: 3a64454b475aa1308541112bffcdd40ea3d365bed83b67e618e25e6cbc7ef03b
font_02_sfnt_off000156d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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