Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe595354b2ae57b4…

MALICIOUS

PDF

83.6 KB Created: 2021-09-21 02:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 55885a1efec182d711e3076b306bbeb7 SHA-1: 2e11e98793c05c979076fdd913c821b5a393c684 SHA-256: fe595354b2ae57b4c1be7116d68f4d067fe33f8984ca8a707c78781e7893e458
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=professional+hd+camera+apk PDF link annotation
    • http://suriyedostlukdernegi.org/image/files/ziduromipanivefeduzufuwev.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/91991421747.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/4888639205.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141b2749fce5---tazulixenitox.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/66720496103.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613dedc97a7fe---naluputagaf.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161478c5060b0a---kupip.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/relokijujor.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/78914705857.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/47847489690.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/90139052673.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/vijarerotijif.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/fuvawu.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/dasinalakanezinagela.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/kaguvisupiwad.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/201701197.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/14682690421.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/4572028149.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/8069747752.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141b3a9c179f---xolidegopekalafezowolufin.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141731e48cea---56200901108.pdfIn PDF document text
    • http://digifast.cz/userfiles/nixufopuvojezodofizozetef.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021091906312150.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_off0000dbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB1 20112 bytes
SHA-256: 7303f145363b2e6de085c34f3ecf74ea57623cd3e8b74db344cbe3d7b83fc9ea
font_01_sfnt_off00010ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12815 10880 bytes
SHA-256: 8cef17578f88d6a36cca9a1bfebf5c78fbfadca295ff32974d02a6cf2f15050f

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