Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d97edb1b1764b2f…

MALICIOUS

PDF

99.1 KB Created: 2021-06-17 18:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 93af5449590390a5b802d7928e049df5 SHA-1: 40c216ecd6ecc26ceaca93b2cf0dbd3b0e476036 SHA-256: 5d97edb1b1764b2fe071e2fe275d6e3db5f0cd23778813c015966bf14920c553
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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-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://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989f07b94bf---28165416581.pdf In PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093378f3a59f---12249432601.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/pifasub.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd988f92f---76861941497.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/0jssmoal6ogd49771mqvihjoq1/palodemuk.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/22182840485.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/425bd2d022fdca434aa9539556f243b2/24245777283.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/c880550cc36fff5cc67aed33ea24f257/degiv.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/e702cd203cce583f177ff1fb7aad70bd/luxegiwonujuvodanugunix.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/34420199363.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/bisubo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/71818622753.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/480effcf012543ffac4fe4195be7704b/6194047862.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zuzabozukezubixovew.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/07b1ad814abb45ffb7d0db51d8f1848c/41752940710.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/i6j5h7s9jh3k7nu9c14kavtnkc/dufujaxuborixulisamuzexed.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/20706415717.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b2636dca153baff8ea866cb7d5b76e51/jojurapojol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=nct+regular+english+mp3+downloadPDF 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://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001104e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104E 11612 bytes
SHA-256: 20476ee2293fa81945a5decf42c42a20b5d99b632d233a57da8758082501e907
font_01_sfnt_off000134c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C1 5592 bytes
SHA-256: ec511b0c62a360d2e642ddc66c05cf2dababe0f019ee006bdf0c974fce38cb13
font_02_sfnt_off000147a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A7 12460 bytes
SHA-256: 8f9fbee92974b8aeb81b3f4b937773fd512a11d6b7197a742651ad433c1a06b2
font_03_sfnt_off00016fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FED 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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