Malicious PDF — malware analysis report

Static analysis result for SHA-256 4603f15bcd33ebef…

MALICIOUS

PDF

77.6 KB Created: 2021-06-08 04:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f48e5d9d86ac6c4aaf8a97cf57e57849 SHA-1: cc6da291db42ed1d2b2bcc7de7708094e9edc04a SHA-256: 4603f15bcd33ebef2e45104372b48564bfaddedc2a9a981b46054013ca997ad4
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 ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for phishing or malware distribution. The embedded URLs, such as 'https://infrive.ru/uplcv?utm_term=skydrive+cargo+drone', are central to this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://infrive.ru/uplcv?utm_term=skydrive+cargo+drone PDF link annotation
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdad4172f7---1467794651.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f457e4d0ca---57023725285.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/eca31b7d741441f0996501562550d998/wuguk.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/aea5ded4d897683303e4a9f46d1629ed/64281017465.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/kejegowimixa.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/kujitul.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf0f3a23d6---petiw.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/qli3b9ejprh51s7prp75dkccoo/riruzorowodosamipanubi.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/zifogoran.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/legigeposiwomimufanubedig.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd4bb8832e---retotipe.pdfIn PDF document text
    • http://praguetransfer.com/files/file/98252764914.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608a8cabcb9bc---dixapusiwakupoxusi.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe0bc7f660---boxukejumojelazezu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4vv5o0fvkst565clm2mndd8biv/xudadiwuboguxujipev.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/5737879142.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b903dc5c2b---boneramadutumizugixidi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832969af8a7---pogofituled.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95E 7892 bytes
SHA-256: f601bbcd61db0a5712f9736a3e8a158476f52ec76e178b82ac16afe3b43d83b5
font_01_sfnt_off0000f45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45D 5228 bytes
SHA-256: fb4e0cecd415fe8976e75feb276490cf69b66723fdc367a3bd63f4095b23aec4
font_02_sfnt_off00010648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10648 10348 bytes
SHA-256: ba832404fd466b0504f3843709e7b8c939dc24602872af9a726121b89d8b1463

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