Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44275bc3ef0ff98…

MALICIOUS

PDF

81.6 KB Created: 2021-09-22 09:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 72d3aea80d80b4d185553764bfd07d4c SHA-1: ce4d7e72edd75bd4603ffe0bb79cd6665601e3f0 SHA-256: c44275bc3ef0ff988fba8034bad9ae752bc033060e2bf05995bfb0e7dedd8b83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicative of a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=list+of+android+apps+safe+to+disable PDF link annotation
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4d2721ea697442657a4810e15e7f9d90/30507715876.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f48e7d3957---7987530581.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/jodizevepogogokis.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/14341331289.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614468ed8069d---81034934074.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/xipijafuwob.pdfIn PDF document text
    • http://ranch.pl/files/file/13967266047.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/kogusitezoxalataroz.pdfIn PDF document text
    • https://service-panev.com/userfiles/gotifavi.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/demotomizop.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/25222464821.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147988d4e8bf---96118683926.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109012151534931.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161409024a3322---50576753090.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/fokegobom.pdfIn PDF document text
    • http://www.sczct.com/up_files/file/lejebemidomadenakik.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/gonozegozovexorepa.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/83861577727.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/vosimuti.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/mipobarovutapiradilad.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/toguzozujosiru.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vubumaremeresolefujob.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/91582398941.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/51ot4i555q93j9i1hvmf22eij5/tidokamagula.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42F 10588 bytes
SHA-256: bcd9cd99795d0e4ac7126cfa7df201d2a1e78286eb632280686210393e58c223
font_02_sfnt_off00010c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3B 17168 bytes
SHA-256: f42b1abe45ff4bfa4e33d9f662ad3c49a6c69c189b23f8bfd2a60937cc7427a6

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