Malicious PDF — malware analysis report

Static analysis result for SHA-256 39232692279f97e7…

MALICIOUS

PDF

85.2 KB Created: 2021-06-26 08:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ceac8d5bc638778206d39946e52f0e89 SHA-1: 7495a72b040132de7188817f4fe67381d39db4e8 SHA-256: 39232692279f97e75ffec38840269e7117ca637f2200656848991cfec542deda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many hosted on disposable domains or compromised CMS uploads, suggesting a link farm intended to distribute malicious content or phish users. ClamAV detection and ML classification confirm its malicious nature. While no scripts were explicitly extracted, the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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 https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa3fab65c2---bofinax.pdf In PDF document text
    • https://rinducm1.com/contents//files/felozusibikesopaforofit.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f3dd68236---giwuzorixenevitap.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084f3793938d---dovawaka.pdfIn PDF document text
    • http://hpmcfamilyreunion1968.com/clients/83891/File/72032503346.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/dezuxiv.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/21010464972.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/xamenumutemiwa.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81868629204.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088adfc1e235---sefanojanofuwoxifoxe.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ee16cf796---29350286252.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c64d771a241---358434886.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/5i58bi9pvh0uorcs4cnttdig5a/28763286470.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/89923728890.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/doxisigozogefebegaxabu.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/53638711282.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/fe1ghd0rrahuj7kc8rp8lh60a0/80415034198.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/1j9b6kmiv0gdfm53lf43dqrsvs/72031013856.pdfIn PDF document text
    • http://pattersonandoliphantfamily.com/clients/875492/File/kalelagujosejudedasuvovul.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/39739292571.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/rijogob.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44c11278ef---rorenewediwibile.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8c90cdf5e---fajuzaxeto.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/sawobulogizogazevazoj.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/79954345122.pdfIn PDF document text
    • https://bem-sa.com/img/file/pusujedepesurozone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+construct+root+7+on+number+linePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE826 10596 bytes
SHA-256: 9aeac12c2c2e49f35c926e38d682583bbfd4c8927b3fbb7959bac5a8b0587f51
font_02_sfnt_off00010063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10063 16752 bytes
SHA-256: 7c1a8eb0b9c23cf203c969b5d5d5631f8eb4ae760335902abb309347e0b2a7e8
font_03_sfnt_off000117f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F3 17620 bytes
SHA-256: 3c097e7920f14b8752dec0dcbe28962bdcefe7a1801e4f4bdc9b7fd7460f36b9

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