Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7f8703226629a5…

MALICIOUS

PDF

87.9 KB Created: 2021-06-25 04:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 2d3f825633bb7e8ebe22670c2882c9ee SHA-1: fd4f13364ec09acb8ffaf36d12cebd893486b1f4 SHA-256: 5d7f8703226629a56d9f5f0bb88d30c486f1519f3c552ec3e6f35515987adbe2
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, which is unusual for a typical user document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895a3365b8d---47907385157.pdf In PDF document text
    • http://iccarrentals.com/files/file/11095524045.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/f73bd61ba35dbf592b26aa2b33cb5937/44261922001.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/88962894114.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/24774601587.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/81bsjf817jbfmkam12jr44iva2/38743672746.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd334268b9---83908495390.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab0442b336---pateritipaxagubokufivopin.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/24383261647.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/2fe4978e7d5c13e888fe7a58a931ee2a/kavanemogemobejev.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/51404116588.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcc1c2e306---82388100088.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e463957ba---5859263270.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071be1405112---35582412032.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/08815262bb256cf223c613e74e09e6a2/bilixoxefazolakuzot.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb60bd32b5---govez.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/6dbee7eeb07556da06b4999643ae02c0/bukironaromepunejuv.pdfIn PDF document text
    • https://ebooksweb.net/files/file/53849341781.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=canon+vixia+hf+r600+manualPDF 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
    • 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_off00010638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10638 5156 bytes
SHA-256: 60a9c25e31214ae579889f0aa6d102dfbebda411ee2b2b59c620bfe117ede901
font_01_sfnt_off0001179c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179C 11092 bytes
SHA-256: c43f0a718eb44ec41182ada14c32c776baef55cab91ece294468eb77d6772d96
font_02_sfnt_off00013d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7B 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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