Malicious PDF — malware analysis report

Static analysis result for SHA-256 52bc644b859fb17a…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 01:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cdb43d5b85be4efa2c570f4f979f9267 SHA-1: 72e4d1930f4cf4b2d480e597767057659346b2ef SHA-256: 52bc644b859fb17a35ec8a46da0432ad17d5e3f68f3d8853957223edc8df9004
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute further malicious content or phish users. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://datatech-int.com/userfiles/file/lefofizaluvapapanejeb.pdf In PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0ff3533be---31673517414.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/87b9fcd0e8c55f7ff9390192b12dc232/80612631580.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/kebef.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/38074906244.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/nasorumigit.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/15597603679.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/15955157284.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/6v3i6ggnfuivacchcf43pjvnc4/85605273524.pdfIn PDF document text
    • http://pinxedien.net/upload/files/jiwuwavarolimo.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319650ed0b4---rakadafimedapagimo.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/s1n41n5t79j35c6qaq1hjqtm1a/42515384537.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/13140327302.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/botiseledikeduzerugo.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607da8e648686---xogaderejepevepefegorefo.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/pikedugokogafufasizofu.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/24310454547.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/kiwifeleravabupinubaw.pdfIn PDF document text
    • https://camelcarpet.org/d/files/karul.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/14726896423.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/80505744827.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/tuludo.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/n8j0ffgcrfrrlv868qvnb6ighc/sigigari.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/73302938809.pdfIn PDF document text
    • http://skupka54.ru/upload/m/73358620963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=computer+graphics+book+pdf+by+hearn+and+bakerPDF 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_off0000d58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58F 11500 bytes
SHA-256: 880ee54e4bcbce38610553ba75aeb059dca6f7826584bf3a2b3ef1c09cb1c91f
font_01_sfnt_off0000f03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 17272 bytes
SHA-256: bb3fd9f1aa979839f5e4f7c9a85ccf2039fda9c658c8e6fc34a776412d629fb3
font_02_sfnt_off00011d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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