Malicious PDF — malware analysis report

Static analysis result for SHA-256 795502a30fb8ec11…

MALICIOUS

PDF

71.8 KB Created: 2021-07-18 22:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: e97d5840514784993ba21ca60a9761ce SHA-1: 75d9348162b18b337917a5e911efda46ae4f164b SHA-256: 795502a30fb8ec11fd080715ef70d7f180d6cb67f48f3aefbdb8ebd086de622a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites and disposable domains, suggesting an attempt to distribute further malicious content or phish for credentials. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd695c3e69---92765116794.pdf In PDF document text
    • https://bd-sokolovska.eu/userfiles/file/fokufiwa.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f18voa616ecv5ko6213m7n03n5/19477202431.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/94qa1ucbi5qd3n504kgcavt6v7/fanupaxewomuw.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/c4e91ce09a37099c4c6080dd2b715014/menixuzum.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079d3afb2a0b---56161804063.pdfIn PDF document text
    • http://muszempilla.com/files/file/fitemizosuxizekij.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/26605352239.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/53i0kvqakmb000ot1aldcim36i/87197645983.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/66479572853.pdfIn PDF document text
    • https://senfina.top/uploads/files/27862431833.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/88754236543.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e27b467ddc2---nexofoselalalowov.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///wisepoxavanabotukixodil.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606febc5dca9a---dowore.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c61de44cacb---wadudunepukukijopok.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c83c5022a---36717001085.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/faxubidixokox.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/fc9bvtuj1f3iuofdl8gqoaflq5/gilalodid.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/14871902779.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/jtjr99hbnpt4i00c7llgv87854/bewifakelifakubawobuben.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=calculus+james+stewart+9th+edition+answerPDF 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_off0000b64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE63 11152 bytes
SHA-256: c10ce7c7041edf32c330230d911fb68f31f608d106cb9ffe406c5426feef9490
font_02_sfnt_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 16132 bytes
SHA-256: 3714bffed32de84319748c7ff4c38daf94489b2d6b1fe2ac138368bd8d461ed7

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