Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a44d9a2b5cf0a8c…

MALICIOUS

PDF

83.5 KB Created: 2021-08-21 06:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 238bab7e5e2935a58b58fef4e1157bbd SHA-1: d97f69cbd71b273ebb942205a0010789fe96e1cc SHA-256: 3a44d9a2b5cf0a8c63bfe784d20108bed126616f1143734928e0b10fdbd6d182
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are sufficient to infer a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607081760f349---5061434049.pdf In PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/noremajitozanotuzigefomaz.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/65c048f95dc2d61022f9880efeb42eae/58162508870.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/16401285230.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/71404764815.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/74219783668.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/nc9mj5r6ep1n6idobdujikkdg6/vironozukadogu.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/kodadatetadira.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/72726065910.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/71238668998.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/pujijusojowitaperaz.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/tesenopufanabofususor.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/delegakax.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f04d6d57a13---nejafoweleru.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/64540964918.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a0e4441a6c7---41523759003.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40e267ad88---42220995472.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/83776996307.pdfIn PDF document text
    • https://signika.pl/Upload/file/80014196138.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160937b171ce19---xizevododevelazugapusino.pdfIn PDF document text
    • http://chayka-svg.ru/files/wupikumobof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=exponents+worksheets+class+7PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABE 10692 bytes
SHA-256: 780513642c6ba0eb136ce123c4c8b946c25c7122a62f33fb051a8cc5fd534cae
font_01_sfnt_off0000f360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF360 16680 bytes
SHA-256: 023e5206f5112d17ff104532b42a360180aad0f136cad872e791f40b8abdf8be
font_02_sfnt_off00011ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000136ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136AE 1848 bytes
SHA-256: ebe37dd088900a1601315ebdbfada4487268e914aefeb097cf752198025a5afe

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