Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3f0dfee7d1d411…

MALICIOUS

PDF

99.7 KB Created: 2021-09-02 03:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f6106485c05dc100c8928f99aa1542e3 SHA-1: 2c5951ce93d40fb57c66a253a8cb0eed8ab93246 SHA-256: 9c3f0dfee7d1d4114baa1db2433b6eaa762ae518eef697089f379d17bae69adb
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous PDF files hosted on various domains, many of which are flagged as compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://amghanoi.com/images/ckeditor/files/wazotesitijilopapok.pdf In PDF document text
    • https://abofahed.com/userfiles/file/41708042158.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/zodemafulewiwu.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/3df366ec8c34656cc6da70f202e09dfb/96779607116.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/95871464268.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/korotuvaf.pdfIn PDF document text
    • http://dymenahealthcare.com//upload/fckeditor/file/jopujofarodomiruvudo.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/fufato.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/pusifivedod.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/pigiditazulozulejuwogemun.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/66508288954.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/vdk4cbta87frm4egds87f0ct84/34246108483.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b39a3970c---32707643764.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/1973a4c520de0839cea5d0bf94c0e2a8/vevafek.pdfIn PDF document text
    • https://melz-feu.ru/upload/16169638843.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/lefewudizixiniretopimigu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a438546ac2---limefa.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/ei007fbq8716c3oapl1h03lbtm/87070902286.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c06c5cd6627---ribuxunumi.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/25f957c05ec8402b33e4c1b13070c200/nenan.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/velafoliwupezelusakozotow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=applicable+law+and+jurisdictionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 21492 bytes
SHA-256: 0b0aa06aaa292a53a2738f693a49c15da04bed7db88993907220735cd69f365c
font_01_sfnt_off00014453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14453 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C6A 10944 bytes
SHA-256: a1d5ab23fc4e0b60c937a6f6c771d8e19b1734c46e9419313bbe474fdf675945
font_03_sfnt_off000175bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175BC 2296 bytes
SHA-256: 0d91b93c30cdb4b9fcc5287ef31e0f6d3b75050094e35c3303e90e7f2c1d387e

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