Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfcb359d17088acc…

MALICIOUS

PDF

89.5 KB Created: 2021-09-01 05:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ac04e8339f06bab2d8f9764e541254ac SHA-1: b52556cbf9685cfb9f6b93ce301e86c635b5bb58 SHA-256: bfcb359d17088accaf9f6026d8387ffd3708aaa1db052f5791681d0ea447bba5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links to compromised WordPress upload storage, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to exploit users through phishing or by serving further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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://cructi.ru/uplcv?utm_term=theory+of+special+creation+was+given+by PDF link annotation
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16114721830627---bufifogesuv.pdfIn PDF document text
    • https://protum.se/file/15676423121.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d39fd777dba---xigeguwilazifutolig.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e3a3862f6---xopebuvo.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e4b669d1f7---32484328036.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/dfrc0dr72fufmveajj9htifad3/24418179613.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/85191169458.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/zirixekirofomogoxurav.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/56244271960f07636fc25e87f8f29a33/winomup.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/65310065231.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d989079d50---xemojuruxabavuweg.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/82194026493.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a4131d4518570a9d155bfb4b6cc6178b/22384897.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2fa2f279c---ruzav.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68f1956bf5---79271096877.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/26918577558.pdfIn PDF document text
    • https://goodline.by/userfiles/file/koxafot.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/01fc9f9708944e112d4ba25adc3e7e6d/54553898373.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/75696936045.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/23438090779.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/49823548094.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/31071a5b8faed13335bc53e15298f70a/6688871090.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/5d729eff0c8966c7ca6824642329ee95/52937101602.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160818d1575c3e---73351714103.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9712b6b87373758a30490e07f60e4612/4272660264.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_off0000f579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF579 18536 bytes
SHA-256: 0be78f78bbe4a96d7bac58e9a76e1a0494fe8438722897be3c9483f2f916e150
font_01_sfnt_off00012564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12564 11128 bytes
SHA-256: 3d1a95837913ea80f1db706acd0ae9d7743784280a32f4a0ea1f6e2446309e89
font_02_sfnt_off00013f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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