Malicious PDF — malware analysis report

Static analysis result for SHA-256 4acf7cea4d1ba694…

MALICIOUS

PDF

113.5 KB Created: 2021-09-04 15:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e6831e1ae36fddd9b6aa5961a8b79980 SHA-1: 8f94bb22bed53b290b13de2f05b61b059f4ecb46 SHA-256: 4acf7cea4d1ba694efcfb65372959767df411e00678704f8028c2fc4150930d8
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised WordPress sites and disposable hosting. The presence of urgency and invoice lures suggests a phishing attempt. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

Heuristics 8

  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://krisoc.ru/uplcv?utm_term=negotiable+instruments+law+pdf+de+leon PDF link annotation
    • http://svarovani-tig.cz/userfiles/file/dozomajesev.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/dajirusexufetotowofaxow.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083fa3b2e739---lajabetuzufoxugosavebof.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6f4f5cf84---dinawisusosokofaxirimaga.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6de8715a1---tunepurabomu.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd018730909---38086865772.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/sitatuxanikutasiberiba.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/4fdd1287a0b772c025edbd818fe67df8/mukudeg.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/15234876460.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/c6rh1v1cvravfl4f76ngmle3aa/18611655243.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/s2md9qub4n41hhl45va3rft78q/firezogadanulobijutox.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/381ac1479ad312b98c4f0a6c1c222878/58460091519.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/1110314722.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/59863014001.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/0dd575de95a2bfa5e8a7f1aec0f6c064/nolodejogiwuxulen.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210812_78FCDF49D58055BD.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/liravotekibodibozisobasep.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/85072392490.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/nufalibumuwisuwajosuwebib.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/92328662514.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/9d359c1e5529bba71820249769e54aac/sapafibilimipixakapexa.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edb2c38a303---13939389988.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/89882547753.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e449aae4fc---xokofubopopulegaxida.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/2128060110.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/6714286507.pdfIn PDF document text
    • 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_off00015885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15885 11144 bytes
SHA-256: 63f4392eccc7b2e31d3faa18697487a22333c72111c93ad500da52a21ec7146c
font_01_sfnt_off0001722e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1722E 17648 bytes
SHA-256: 583350b5e001aa792f33f8a02be8beacaec3a4c18e0b86fcb6a57f871d293c3e
font_02_sfnt_off00019ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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