Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39c657a96055f14…

MALICIOUS

PDF

80.7 KB Created: 2021-08-10 15:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e215e5d22257c067f4b6e8014b76536e SHA-1: 5bf188ca923a220c6c04660e9e4c5abd289fae06 SHA-256: a39c657a96055f146bdc87c99d9c1723f7bfe6973365996102ce982c678866d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites, many of which host other PDFs, suggesting a link farm designed to distribute malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the true malicious destination. The document body is heavily obfuscated and unreadable, but the overall structure and heuristics point to a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608c35249dd30---23171505565.pdf In PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16110ff2dd7862---6209522876.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/26efa5310ecae12719c56cda939486b8/miritupozudam.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6d8744176---lewotijupipudimi.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/zisora.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/d9112rug31o8ifb3s2n9uar0uc/14903949842.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16070dc5ff01cb---84884003489.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/55136274617.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb95747e9f3---kedekawonaxa.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/temaxitejinopapirujanon.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b12e165b2---fezegixopoxebizititudidi.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/37529081516.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/74373106474.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc2d512c3d---88374804995.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210714_3A622671E373C96C.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47b0d978ed---zuluve.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/69105575570.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/64622003381.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/a9e04220eecea00064dc3faa01be4b4d/katitewovibixikoz.pdfIn PDF document text
    • https://asi-filter.pl/files/file/gosiwin.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/df3b7c674b14df1b53e7a75dd8c9ef6c/92503958125.pdfIn PDF document text
    • https://wagaskar.com/media/87576934684.pdfIn PDF document text
    • https://autopratichesas.it/file/kusenolurakaderanox.pdfIn PDF document text
    • https://istihdamhaberleri.com/upload/ckfinder/files/tokanoxitifezimujino.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/lomitagemokawibedafes.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/24r2h8oef9esr9c35cs9lgicko/fogukalepuzaveparomikek.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/rsa9nh3dop5eb5km58mju2qoi7/34080786760.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/dumize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+download+bank+of+america+statements+to+excelPDF 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_off0000d5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0F 17184 bytes
SHA-256: 4529e1bd0a3c3019fafc123e38e7077fdd75cd1f1e65d96d2a85592c24999056
font_02_sfnt_off00011a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8D 11048 bytes
SHA-256: e6e959602ae675098939b15b30d4a28c25842638578640443876e3d3e14095c3

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