Malicious PDF — malware analysis report

Static analysis result for SHA-256 a028eaa6007d3352…

MALICIOUS

PDF

90.4 KB Created: 2021-06-16 04:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8b061aac3c9327a7245bc13817ee2e41 SHA-1: 2ecaf489e6f3e9c5822ab2e40ef54aa7147e66cc SHA-256: a028eaa6007d33528f01570053c3f854297bda77b990694620f3fb39dc590e53
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, suggesting a link farm intended to manipulate search engine results or distribute malicious content. The ML classifier strongly indicated maliciousness, and the presence of compromised CMS upload links further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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://medvor.ru/uplcv?utm_term=rangoli+kolam+pdf PDF link annotation
    • http://msinziniering.com/userfiles/file/kidigunuwupaxisaditolukam.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/49522931874.pdfIn PDF document text
    • http://meyanko.com/userfiles/file/%5C/2085905184.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a208378a3e0---gepukavurilur.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/76378488a4d18752c346ce9cca3ca412/94358357875.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/merewivenufixex.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607539742031a---fagoder.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709bf87965f---68925924857.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6996768db3---16854439265.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/cd834afd62b42f3436e2ebe6b4be3b47/nodoretikurepimeka.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/vujipilozobuzuf.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949d9227eb3---22791137801.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/4974fe21e9d3df27d1212988bc24bcce/katevovazudajoguxomed.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160830d7323f17---refogaz.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/60721024322.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824bf87b658---tapezano.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/5stbbsee6ldmu4s6ua8lqch8vj/83949544502.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160afa19473855---sogewowazisadimubojat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.daltonmaag.com/In 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 4748 bytes
SHA-256: ae14ca30ebbda1a5c9b8d373d27943bd7d98e1d23b9ba4a436452956baf06bd9
font_01_sfnt_off0001037b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037B 5844 bytes
SHA-256: 610ef371e3dab6ae84b2d0e8ece53c7aca8be680eec4191ffb437997ef7fb7c3
font_02_sfnt_off00011638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11638 6320 bytes
SHA-256: 72e97d5c1b40f87f0768c5b5c088bc3d7d5492c747e1cbb71bb5ecd9320dd5ea
font_03_sfnt_off00012a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A85 10544 bytes
SHA-256: 1f803ddd8414223587f346a114c1fbd6fa7c9bac1feb0a02ef138e9d0fd78ee5
font_04_sfnt_off00014dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD5 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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