Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba75607b82c92f1…

MALICIOUS

PDF

73.7 KB Created: 2021-06-11 14:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7db02bdca2c40021c6033cd4e580d24c SHA-1: f31326fba09b6c001de2cdbf150cb518687da7c1 SHA-256: 4ba75607b82c92f124124c7092cbb75d78b385cf8df8f0dcb50a568c076f6786
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document uses a lure of 'Algebra 1 compound inequalities worksheet answers' to entice users. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the redirection of users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=algebra+1+compound+inequalities+worksheet+answers PDF link annotation
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/311kv333lju619arjvb3v12ouh/bitojexovinebibozedi.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/govigovanekedetip.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16076c1a872a60---luwetujebosaru.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/80420140656.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f9ea321a2---51284261764.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608069a2dd5ab---nuzadizudijoviwuvumetaj.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/najipematejugakifujit.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/25431abec076d0e9f81b0be322f2d34d/mokewotusesofiwaseto.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/zufusifedavefa.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/gvfbd3b6p5dm8aomvchmegjg63/61664424114.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/2efef165124e5cb7eb7a92f61825f23c/21995353386.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3a37179b3---toxix.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/51459762601.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/fimabada.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44A 5948 bytes
SHA-256: a8788f6f7426a6270b04969101e444f37d7bc444b3ab91062737a34fdec3ae0d
font_01_sfnt_off0000f86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86E 9908 bytes
SHA-256: 4c28bae53ddbdaec23dd9cf36b8b0f2c89d7c9a9e806e414486e706c9eef990b

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