Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a7dd6b1dbd7d74…

MALICIOUS

PDF

90.0 KB Created: 2021-07-03 12:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6ef01145c35a5ade93736cc67f2f1e87 SHA-1: eb2bcaf362bf0a18a4ec6ca0423efbb14f2a7348 SHA-256: 85a7dd6b1dbd7d74c432fe03ddfe89846e6278062bc2dca9402afff3dbe6dd24
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. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The URLs likely lead to phishing pages or further malware downloads. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://crysiq.ru/uplcv?utm_term=how+to+get+a+certain+person+on+your+quick+add PDF link annotation
    • https://koncnc.com/genelresimler/file/68072137932.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/21787880947b3ede77465b8a0553dedb/64978558688.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/54700202781.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4107ccf7c---94134974135.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ee7257cd9e2b9c48a65986eb2314f8d9/rujetukonaju.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/rakufuwizimizu.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/kv3rd22pprkusrggvev4mhpsd7/kiruturibudaveleloxugol.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/fbad9bc79cb03ae17abbb6b6dd7bf654/rupazosigagogamarerefeko.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/60690509654.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160749e5ea1e91---98025282536.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/40192652501.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1521692fe---jopivasolajifeferigaxibo.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27da6a9fb6---86407646188.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/39784739212.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/5f5bacec47ccbcea420b543ac00b6d22/gosimukizosu.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f74dd832bc---misibodiwowi.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/1fff414a8c9b59dcbfeb16469166fb9c/wofogona.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/4bf087edc1102922336f1f363e2470db/13757610232.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/sujivaniwuvavulubet.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa73eb55b8d---nopejomipivamojipitet.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93832b45b2---30926074544.pdfIn PDF document text
    • https://yorapp.it/file/57365439323.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_off0000fde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE6 11172 bytes
SHA-256: 03c087bfbb0c317568d3252436f654efbabcde5fcee6befb2b39efa7ccb28e98
font_01_sfnt_off000117b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC2 16624 bytes
SHA-256: 6c983ed4105aca16b4ffcdb8ffd713006d060169c9dbac0fa1ee20ed26c9da57

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