Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e25d467efc635aa…

MALICIOUS

PDF

78.0 KB Created: 2021-09-03 11:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 04041f6421e705811f428ffd2f5b478b SHA-1: 5fd758fba158185613ac550b17cf80c8364d3e9d SHA-256: 3e25d467efc635aa9477b8724a3bfc72100460268dea4083f9608bd68ef3b761
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crysiq.ru/uplcv?utm_term=finding+vertically+opposite+angles+worksheet PDF link annotation
    • https://sunarchegypt.com/userfiles/file/65391055285.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b56bc9121e---fekiraroretosatipinaxuxav.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a16c343a890---risebolug.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/riwixodatobenewape.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c57f7d5c678---vatuwiwa.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/b201b8030530c55b74f24b985a9d5289/gubudunijida.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/siwuludolelop.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/93950472786.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/nodibapogufezigik.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/4035424082.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/8a65ea9fadaed7d899a1b68b7a44f88d/69258843110.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/9625rrln3uvl70qst7g0fl4d11/87398530861.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/wikelo.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/9490707b2cb3ad30e29a0a0cd0942aea/tuzugusofaxole.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/wutifugudogulexawumul.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/mipilononawunonutitodeg.pdfIn PDF document text
    • http://intergeored.com/upload/File/45864482360.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/zavesademesibe.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/9031470323.pdfIn PDF document text
    • https://roc.mn/uploads/files/mazozugugajada.pdfIn PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/14949896586.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920769edd53---roxawulabe.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_off0000c8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C9 11128 bytes
SHA-256: a24932476fd8d03eb6e426c91c02ac2c12a62296d3b73b429a8a841f7d5dfb6c
font_02_sfnt_off0000fa89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA89 18132 bytes
SHA-256: d4558fc42db09fb4c8b5d07743f70db868fe3d868f94ca17c77ed12dc25f652f

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