Malicious PDF — malware analysis report

Static analysis result for SHA-256 b491681fe36062cd…

MALICIOUS

PDF

90.3 KB Created: 2021-07-28 04:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 67a35baf64b83c891db8654a62b23988 SHA-1: cdaa5c4d76b8b283ccb92de2acdf17bfbd7c370f SHA-256: b491681fe36062cd5fd09390422d7fb819abf6f8ca69da4ce66d347df8559b7b
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 0.9996

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 https://manualismedicina.hu/fileok/file/86411092566.pdf In PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/cp7f0aub4k6f7a0pds05e743g0/3902999429.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/71440789566.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b35d58a32---nuzonubokewatelivawasoj.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/475b333c949ab86cba58387d7857ec1a/4548736913.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/tugizubawa.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/55483154420.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/vukaxuvasopasatomo.pdfIn PDF document text
    • https://bursac.net/userfiles/file/noxedagapasit.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/a49daeeb1d17686103bfbefd56add213/38480978494.pdfIn PDF document text
    • http://jp-cable.com/d/files/8602035656.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/55280811230.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b10a8c93b2b---ruzivon.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/48b347f21ea2bc9fb9af3a0ebf48974a/xuwekugaruxi.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/63084183746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+heat+a+kirkland+spiral+hamPDF 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_off0000f8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 10828 bytes
SHA-256: 1cd1b0316b18ab9742cf49594761710ee5450a4f123116dadf6f8b74cbc1cb71
font_01_sfnt_off000111ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AD 18376 bytes
SHA-256: 07d1366ea261461cc6e6274d8cbe909a827c490182829823dddd0e583cd4f23b
font_02_sfnt_off000141b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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