Malicious PDF — malware analysis report

Static analysis result for SHA-256 13259d314e0ec650…

MALICIOUS

PDF

86.7 KB Created: 2021-09-06 16:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cb33f495ea7c969e1255cb3f31d969c0 SHA-1: 54595ebea7317ab91dd38052732447bc26797d1b SHA-256: 13259d314e0ec650880ea98c394a2f9c7d3bd749d5ed50c2e5e6d90560d0180e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to various websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. The primary purpose seems to be redirecting users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://cy2hand.com/userfiles/kekogusi.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7d2c7421f---ligewopexomiwofox.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/k6ost0d5s4e4js99eimltg6up5/62488234650.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/44ec2ed12eb13cd310c71b84e51730ff/nivazikaju.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcae32cc0d---57011902659.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/benugefupararufobevubego.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/10398596457.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dae07188922---gawusaxokinetefuxedeso.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/6701283988.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/telonijovamamal.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/pimexuzewaravotubiva.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894c7087842---59017389061.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/102f42088d66a7cc5e92bcec3f46dbd9/muwaregidi.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/lavepogi.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/b886d7db8e3d3bd9e4b51e45fa67c127/36021581596.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/xawudifibarevovabagaw.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ad6d19ad2---sarufikowinobazuji.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/niwapokoxosogopizesum.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/12088996336.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f89ac64cf89---1642775753.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/libifusigagitowujenot.pdfIn PDF document text
    • https://cian.hr/userfiles/file/jajajekofisaxaxewobawafo.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/pugegefadatiruji.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/vuzemafemalitefo.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094ad964dd0a---gujeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=barreras+semanticas+de+la+comunicacion+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8A 10936 bytes
SHA-256: 6a476ef5c9a999d4d3778f7ccd885edab44519ee757ecbeb5361178961b0e638
font_01_sfnt_off000103e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 19236 bytes
SHA-256: 6e87ea2f9c0d003ffb1744cedabcfa72c501ee75f50c3dc2d73bac4dbe4f7cd3
font_02_sfnt_off000134b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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