Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b90068bb6003f5c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 18:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 7f792420e11a848d804c30ac9ef8f54d SHA-1: 6ad32c82983ff3f01190ed4e244b31094f527ac7 SHA-256: 1b90068bb6003f5cec8e5a15a87c84c9c4fcdfec672b09de371d5c53fba2167f
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 0.9981

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 https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/a4d0d4f1634e198a466f1961c8b66e50/sijipudobefojiduzov.pdf In PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/664d4b386fb94f227ce221af6bb57262/329750301.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/pesabipumawubinaf.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/85259852372.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/tidaxolaw.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df39931bef---87929977449.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/5575737397.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/bakevisubixar.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f66c340ba5---fedepopesajunisid.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f81b3d72797---45120050327.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b51559c2c---menuwozofujutudowujo.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608439ae26956---gafagu.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215132253468837.pdfIn PDF document text
    • http://cycling-software.com/files/file/pavexigeg.pdfIn PDF document text
    • https://coevent.ru/upload/files/59779211032.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/15715806439.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/e5620bd3666936a864dd9b72a6cd660c/88411835705.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/f3130db784d271e669d064bd23a4193e/jekofojapuvenipuwefuvet.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///41746779105.pdfIn PDF document text
    • http://bdnchem.com/upload/files/tovopekabuvoxonovazisa.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b887dcfee7---53926185572.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161299b03f3b44---gaxofaleti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=5+regions+of+africa+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_off0000d9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BD 10688 bytes
SHA-256: 02f450656b9c4831391ea8458205f8133d6368cdd48422fdcc3b8dcd76220b16
font_01_sfnt_off0000f21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21C 17308 bytes
SHA-256: 1d73ab02bb8713800168baab133459257878b9f04264a075a1b331ad94024eb6
font_02_sfnt_off00011f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1