Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5163c59290399e…

MALICIOUS

PDF

88.1 KB Created: 2021-08-03 17:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3fd22cd70d3ff868d06a3bbf2bdbef4b SHA-1: 6112ad2a0a09e2de3064805a101f4f1b8d64f87f SHA-256: 7c5163c59290399e7e60dc9433b7b0c7a732cc7e431a94eb29936f7bf769aa5a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains a link farm pointing to numerous domains, many of which appear to be compromised CMS uploads, and one URL specifically uses a 'utm_term' parameter suggesting a redirection lure. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates the document's content likely attempts to trick users into believing there are new or changed payment instructions, a common tactic in business email compromise attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://queure.ru/uplcv?utm_term=public+speaking+course+online+free PDF link annotation
    • http://capital96.com/userfiles/file/bisomo.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b29a7bebfdd---menixelafukubapovitaz.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/sumexavixalosavifireka.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab5ad206b0---baxixadedu.pdfIn PDF document text
    • http://placc.info/up_image/ragixejumakeg.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607761e8b302a---84627447939.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e93892b4ef7---dizepukisu.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c76df4a0fee---37450543455.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pmuopl6s4eqcmlnh14hp4108t3/41239274479.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/dogajujixepijetikurigarun.pdfIn PDF document text
    • https://moolans.com/uploads/files/xagimibepusesimelil.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ec5a151f2---44901982632.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/6e979b10fd849af8699de9a895d3e13e/2114001675.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/nopupaxesok.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/cssta4valc6clqeis5ogm5ftvk/rijukumulovugarako.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/v77jgdoe2le6isii52kth7t1t4/jakisotubofegakime.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ip8oj42c69254belvk3u8jf6lb/logidome.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/jetuwutajagexugexaxeg.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce4ddc52d9---95796448957.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/xuwovur.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/oa9r883g9m24pgl10gcgeq96jc/namuruxewegere.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/8061496269.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/92268040889.pdfIn PDF document text
    • https://ms01bet.net/contents//files/18676330282.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/69vau6kfmfp79268h9lq8cs497/73827484304.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/lozomexesuxesidamuva.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/95876312568.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/84115402870.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_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 10892 bytes
SHA-256: 4f3837ce35153a094e3e82c6b6725c5dc35a95935ea16a545ff3975a66a1b292
font_01_sfnt_off00010d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0B 16660 bytes
SHA-256: 53a5a4f4bc84e3a537df273c0e3c631c59b971b8c71d6408268c37c4b850078e
font_02_sfnt_off00013878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13878 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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