Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf3cc418f8db78e…

MALICIOUS

PDF

86.0 KB Created: 2021-07-26 07:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 329f05dfedba4f27bc07b19e80e1ed48 SHA-1: aecf35adb999d9e831250e34685adb182ac834d2 SHA-256: bcf3cc418f8db78ef1f2088e3702cc74965c49968284b5b18e8b9e92d8b97715
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV both flagged this PDF as malicious. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised WordPress sites, suggesting a phishing or SEO poisoning campaign. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://riggi.ru/userfiles/file/jowegaxij.pdf In PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/8055848fec176dd81bafedb1448e44cd/ruxes.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/nukirisoruxobabudel.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715c146f97e---88113906059.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/feb7aa02aa2f2a630035e25225d74668/wajatojomegosuva.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab312afe8c---15130476746.pdfIn PDF document text
    • http://iwishop.hu/file/47380249833.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/5403555e49003628fded866606967944/90650188064.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/cc455538bae3b4ba7a248e1285d10e2b/jijagawojin.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160926a392a081---vifijavidiwukuxen.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/22955326952.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/netojekezek.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608289392ee2c---36780024416.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/70980478443.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160782bdf8d85e---kobovosavonezedeliwadape.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/47853768794.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a61df1c3ef50e07cd32e5588d3e85ac4/bukizaxuronevatin.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/58712129601.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/kolazabazaxofuxadexomeril.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607158239768c---moboz.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7bd9c64b60---xikupuzebomowekilu.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60FDED5EC6D02.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/67b237746caa53412794bc3e7f56c484/lojemixuzovesep.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/96616828947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sri+basavalinga+avadhoota+video+songsPDF 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://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_off0000efad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 10808 bytes
SHA-256: b5e4ebec6eb9bb8005e8efdd09eecd73eff662112348966bea2bc362535f37f3
font_01_sfnt_off0001084a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084A 17508 bytes
SHA-256: eb07adf3a1bc545e7997d465c344e83b8d07134da0e5785b743f1ef4fada5054
font_02_sfnt_off000135f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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