Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed4b9a582908f3a…

MALICIOUS

PDF

102.1 KB Created: 2021-09-04 23:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b18303de1372fcdfeaa27c5254ef6336 SHA-1: 60443dd2e30366fc286050d91cec45ce2f632779 SHA-256: 7ed4b9a582908f3a1067a246e7a1ad17ab39f2342a86a99671a4ccc9e4ffe6ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to potentially compromised websites or phishing pages. The presence of external URIs and link farm heuristics suggests the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://archism.ru/uplcv?utm_term=pedagogia+da+autonomia+pdf+para+baixar PDF link annotation
    • https://iringmalaysia.com/ckfinder/userfiles/files/belivulo.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/vuxonasazozupodo.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/6b4dddae34fbc4a5fe0beb5aaa134df6/gatafiwopakelu.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/8e5291f6658464d8f6cd345706a58b90/63292213062.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/fedakadalusinixetema.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/19177143007.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608115f7ea25f---33110696253.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/qco0steor5v08aodbmlu94o6v8/75054417942.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/zufalovuwub.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608626f1cda78---kabazojopofupo.pdfIn PDF document text
    • http://uci.ir/userfiles/file/besagalibunuzavivajumi.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c46ef1ef39---77332097637.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/32502060441.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210629025450_6bazig.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b91150a99a---nuxelojijivataroxuxateg.pdfIn PDF document text
    • http://nutrisoilvietnam.com/upload/files/gewemaxodevi.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/sirenafiruxitixagavoma.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/b6j0m23ip82fu2b2ob3duncam0/dowakujunizeginoxumak.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fa2af37fb---pilixesupotopopivadat.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/0ukrt08pk77if7vjk5llprjrk2/36362430981.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/76171868459.pdfIn PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/liran.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-8-16/20210816200346377520.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_off00012650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12650 20684 bytes
SHA-256: 2366b8c539eb7e466e04bcc0bf3cb579dcf1255943734a57a6eec9ad918effdb
font_01_sfnt_off0001596c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1596C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17183 10972 bytes
SHA-256: 80a4f059f0ad4180d056457309c0fba1130570ff5a37b33d65becb0cc2ca518c

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