Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f7bcb609f2672c…

MALICIOUS

PDF

91.7 KB Created: 2021-08-31 13:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: d65866b7e5f93ad364f71e249a334c56 SHA-1: 03f12dcbddc6d6b98a4e0b4d18a8ba77b6846dfb SHA-256: 08f7bcb609f2672cc6f0d38429a7cfd0551f2c3245b4c424a98e505d6fa09951
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://crewmak.ru/uplcv?utm_term=staple+food+fortification PDF link annotation
    • http://stardentalcare.org/userfiles/file/fikejowoguxi.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/2827a1bd4bbde2f746d2826c8b183fe2/19702652393.pdfIn PDF document text
    • https://unicornccc.com/ckfinder/userfiles/files/koxuxose.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4a879a870---gupejemosawimafa.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b89363109---64001963370.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/fojokowopuk.pdfIn PDF document text
    • https://noddy.nu/images/file/64176972647.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c7552c2a29e---zalodadunokevako.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/58217463532.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/42078140688.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/b786917a227871e3cfb64b9422c91f54/melezewezesugusuvobozuz.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160883d195dcd5---rulijabedifidaw.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609648029b268---muvovisovajokabufasaz.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160764025e5eae---63259385585.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/44686884379.pdfIn PDF document text
    • http://unsersohn.ch/images/file/58942213165.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/065q4u17ptl4u26j0s7mpp63b0/tuvoloxemamamakarosop.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16294600100744.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/fapaxawabovix.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/lovabogibifosikalabud.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/judagalenikun.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/98347278278.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/98910227567.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/wefelomufuba.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/de9c69d2ae59c2d27ddc55436d9d9255/balalebuxizodimefexawi.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/powatekigumafinetawiliw.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_off0000ff09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF09 19120 bytes
SHA-256: e7df70ea30373b6d7cfd8056a22938043a83149be7017af62a207a1e67ca62f8
font_01_sfnt_off00013100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13100 10520 bytes
SHA-256: d813306ee72d03a5444f10982793c9ca70e5d98bc294bcccce037aa4fdb1a5f5
font_02_sfnt_off00014903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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