Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d414fd698aa5e92…

MALICIOUS

PDF

103.9 KB Created: 2021-09-06 00:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e9c5bb8be38275a3981b2160d52b2f44 SHA-1: 74abd8c4b7bab6f9bb02d470b9c54ad40d6d8351 SHA-256: 9d414fd698aa5e92552879c3b2b4c81da2f5e128095b50d2175b6038e4345c16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests the document is designed to leverage SEO for traffic, likely to lure users into clicking malicious links. No scripts were extracted, but the presence of external URIs and the link farm structure strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://smidgel.ru/uplcv?utm_term=campbell+hausfeld+impact+wrench+manual PDF link annotation
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078514f80637---wipawataluvegokuvolimobel.pdfIn PDF document text
    • http://whatdwellswithin.com/file/sezutigokekenanutigozadu.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d926b3565e2---juzekanalugirupuwig.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/logodidinopotagu.pdfIn PDF document text
    • http://signauction.net/userfiles/file/4407363332.pdfIn PDF document text
    • https://ntc-container.com/upload/files/22720975950.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/sawarurejizumijilepok.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ca1e508e908741450b54950638d6c8ec/16691822536.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/kebilotepesomuxe.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f78957e2d3---xifamabox.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/o7dm0pqjskc0t2ncj13ekitljs/25675989350.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/33503845099.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/80618561650.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c724c44397b---sutasininagi.pdfIn PDF document text
    • https://tigapilar.com/upload/files/xojuvam.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/4956345682.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609241e6cc0d3---dumetapojetojigozo.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/94969825487.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/90355014113.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/f2400bcf7deb084ae5a61caf80760ca1/wavodenifixoguretedoweta.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/60728677385.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/wugugidak.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16082b52e28d10---38686661997.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/15079746009.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_off00012c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C92 11124 bytes
SHA-256: a7460890791840dfc75880ce7f8dfdc8ac4d0ead9ed53e42b9cc8315465f4576
font_01_sfnt_off00014620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14620 20048 bytes
SHA-256: d8d331d0e42f8c7645d49036d19aed687c85e4f0f7f8c08da4ee4eb4eb7bf2e7
font_02_sfnt_off00017940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17940 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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