Malicious PDF — malware analysis report

Static analysis result for SHA-256 c640bd5898f9b7dc…

MALICIOUS

PDF

85.2 KB Created: 2021-09-08 12:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b480d47c896e0c65438447afe08c31c8 SHA-1: 4e5966a64ada3d4fe9c94dc92e98da8f2d49b65a SHA-256: c640bd5898f9b7dc45c8da617e4473a4d82cf091c82102dc644c7aa40aa30097
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6372

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://ahcxdq.com/uploads/file/030423179931.pdf In PDF document text
    • http://studiodispirito.it/userfiles/file/texepexofuvumox.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/77vjmvio8p1aonvdmb2ooq8dc4/29473082711.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/93533201482.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/34611802485.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/pukugepatowipekakir.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/defakevepinatupepakapanem.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cf508b592e9---ramogetilunumudupezep.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/digerojana.pdfIn PDF document text
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/tuxowebolisugewofavatojid.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/sujokiguvasuzelewosiloru.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/91881582165.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c496d54ff8---40002724658.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/wuwogopixisen.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/65521198396.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7ebe35c3c1---wutametexepuxexekapoka.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a694335e0b1---guxovadufawegojapube.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/4861029544.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/toturugekixodikojidufido.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/bobisokofato.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/tcdjfvu87noj96htdlf6jb22q7/74750322605.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/xevijazasoweladuxifukajez.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/73393306184.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/96707923478.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/hp00vqrlpbpu2gd7tu2cagip8b/wuwakefu.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/52345090339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=maternidad+subrogada+a+favor+pdfPDF link annotation
    • 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_off0000edf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 10928 bytes
SHA-256: a62647017ef4ae988ef284ed5e17e47430779530b663e912dd009c66d9e470c5
font_01_sfnt_off00010709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1B 19468 bytes
SHA-256: af65ffe21769dc9a3e7faa4e0a2c51b9c1ef8744ee8eabdda83540e4d77ec52e