Malicious PDF — malware analysis report

Static analysis result for SHA-256 c00fca64459e10b3…

MALICIOUS

PDF

140.5 KB Created: 2021-06-30 06:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c136f8b0f125930a3c202fc0e40b325b SHA-1: b0de14f078e8411e230955a96409ef72ae468e0f SHA-256: c00fca64459e10b31de0c18e92492badfbfad6f18cc36141e73f63267e2ff25b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9775

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://irlanc.ru/uplcv?utm_term=nmap+os+discovery PDF link annotation
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752433c7038---sefomazitazafo.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/nugurox.pdfIn PDF document text
    • https://lecapsuledigian.it/file/11861155979.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/58234649384.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/a54c9d98540b87f19ea63c74a2879283/57964241745.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/4f557240c33b4417b6d3c7a30d81e7e3/79397002082.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/c115228593dde316cb977173c92ca7e1/9769888704.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce43669e3c---vifepa.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/rasabevezop.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/16929509077.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160822b72b21c3---funeg.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/36288751525.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a413c22e2ba---8303075734.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/rurijepilene.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c853139577---75871441358.pdfIn PDF document text
    • http://hkacca.com/userfiles/52797664616.pdfIn PDF document text
    • http://erictex.com/ufiles/files/daragufev.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b3f43329e---mewimemebuvepabesotutev.pdfIn PDF document text
    • http://conroeclassof72.com/clients/d/de/de0acc14889d5d69ce6a2e221f3e79cd/File/17203972702.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a533112f7ad---dodoterovuko.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/24425528457.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608611f313556---63621013770.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/5v24nabe0hljf4opb69lc82tnq/49787438647.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/85322942861.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/jozaxusenagotuj.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001078e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078E 10584 bytes
SHA-256: 2b012e3b1ef15e5162c31ab138559a7cf4b07cf0a36a8dee521f0a803652bff3
font_02_sfnt_off00011fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC1 17140 bytes
SHA-256: e7c0b2a893a0ae531adb4479872473101567dca975aa0ac4708f5f3a966cab17
font_03_sfnt_off00014ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA4 85268 bytes
SHA-256: 671241d65ffd8c522fc238dc159294400872ce0666b970e3d214e3eed55163b4

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