Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d07b91099478676…

MALICIOUS

PDF

103.4 KB Created: 2021-07-03 15:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 07ad6869b042cd098efea04866250f3d SHA-1: 935be9e21e34da462799504d5f8924fd568c6d47 SHA-256: 7d07b91099478676663fdc1ec2053166e69a4c3fe300951f67281156f33e8727
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=marvel+movies+from+first+to+last PDF link annotation
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090c03994028---94519653420.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/kadekijenurakonidudulivaj.pdfIn PDF document text
    • http://0930actress.com/files/files/xunep.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608462e008ffa---kibamurimojob.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/18014448795.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160903d3c006b0---58186713517.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727432c55cd---fizisodekefomobi.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91aee88fac---43293483977.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608918b741c61---telutiv.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608db0892ace1---26874835083.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160730fd090f7e---difobiloberuzulen.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/sagarobadoveromonaxukugo.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6371f2428b---41420976384.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d82ed9e55b---wexesavasuwuzomesigewoti.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/virogisugug.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b29b5e7e7af---jevuwene.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/lafelukopaluvosoxekow.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/3f8da4dc9b3d6e2528da8a9a23a4b6ed/34776792475.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077db3490232---29362474368.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089c4367d064---vutafafures.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/4ucju7vuspdlq9v5uoigs1sdp3/81385059371.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6ff3e5a2600bbd60bf5ff45745f20c60/81684840609.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/dfb2dcba472957d8ccb0fe359fdca41a/doxaderasonek.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bca714c74d---4676449113.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608173a4e98c7---49854467398.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_off0001319e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319E 17896 bytes
SHA-256: affe51156cf60630645177b3ca7d7ae3cfe3d5b11c6de9948fadd151749e5b7b
font_01_sfnt_off000160a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160A5 10332 bytes
SHA-256: 70572dd2116961a04aff2dc8c3ea26f2585e60d254e9c40805f528dc8bfd4d1f
font_02_sfnt_off00017802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1