Malicious PDF — malware analysis report

Static analysis result for SHA-256 71bf38f1f8d1bbe2…

MALICIOUS

PDF

83.2 KB Created: 2021-09-04 11:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 4a18900b16bfffe981d3342a199ffc72 SHA-1: 8e072c6a9e998cc8c6457b8d70cc1820f0edb3ac SHA-256: 71bf38f1f8d1bbe2752a223944ba21237769362df2e7228c76e51d460778ffbd
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 0.9974

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://mikomisushiwc.com/uploads/files/4990064884.pdf In PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/bazojexedexe.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202191117562848.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16126eb04ead74---50569224981.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0338791b2---69069633905.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/disikofeviga.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/67855468635.pdfIn PDF document text
    • http://wsm.hk/images/files/basaran.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/zisibivumewelijexoluw.pdfIn PDF document text
    • http://valeneighbors.com/userimages/49725559945.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2c118f388---bosexekituxaz.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f8ce6bf28f9---87298192750.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/83555604919.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087feb27186e---94460362971.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202108141915334976.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/nuzilakipaguzopizulapulo.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e819e8dd7b---mujuvurufaxozawepusuj.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/bobutegaxiganaxamokowujop.pdfIn PDF document text
    • http://nessium.net/userfiles/file/kanixupovekudaxab.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/biranotorumapufa.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/jazajolivuma.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/tirajemu.pdfIn PDF document text
    • http://leguido.net/files/52906640119.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/n0gcs9m0otkae1le0haapsatl4/91640984822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=structure+and+composition+of+earth+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_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 17548 bytes
SHA-256: 0ac56eba3aaa0bbdbf26333e50e6607e25286d9d1d897792ac7e2ca2328c1834
font_01_sfnt_off00010d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D43 11016 bytes
SHA-256: 73b941fd18ce6ad4f229a5d78d512ea07e4ccf1ebdb378b0c704da0c8fc42b1b
font_02_sfnt_off000126a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1