Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04954e8158f72c9…

MALICIOUS

PDF

100.1 KB Created: 2021-09-03 21:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b88e2097c847b5b762714f8921917f8f SHA-1: 1716652e3f9e4108d82c8609a5b0811a7af1816e SHA-256: c04954e8158f72c98919ab619e97afb9543cee796c592a4e4c1ce65f107508ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious PDF designed to exploit users via redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://pixomot.ru/uplcv?utm_term=regiones+naturales+de+chiapas+pdf PDF link annotation
    • http://sanarina.de/ckfinder/userfiles/files/23835648494.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/togibepuwuxutubawuzi.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/xovagoxokakedozarol.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a910a3408f5---kutizuwegatisokowejas.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094273c25ca3---34147736087.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d263d61f21---datokiterejul.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/70835103128.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/5800238377.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/lelar.pdfIn PDF document text
    • http://scan3dsaigon.com/upload/files/65993150181.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/247100781.pdfIn PDF document text
    • http://antiochhighclassof70.com/clients/4/4a/4a4d67c83f6236388cbe8d22d68d4f91/File/42739945084.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/05202837689.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c54f7e82eda---kinogonugezavixutizi.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/94302d8dda03998a6db0370e12badd43/17344814740.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/mufuxawejexafaluluw.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210629085903353.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/zosodoramatoxip.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/37626332753.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/b8f7f928bf1e2bba912fb8e8653ce407/savuxuk.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/wematumiwufuxazawuful.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/1c61eef701e45afbf222d22156881b1a/23861657908.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c325cfeffe4---24751863416.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9ccdd403a3af8e928fd949a2de8b799c/93975992345.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/44114296008.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/51683200574.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_off00011c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C18 20692 bytes
SHA-256: 6e21c9a076fca6c4a9ac5d2492dcb368872fa6c6217ee357aa27dda4c7111a3d
font_01_sfnt_off000150df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150DF 11044 bytes
SHA-256: 4d0a9042c528cb2a19df4cb51c83f8ff6482d542a7359ca4990394970bb72b3e
font_02_sfnt_off00016a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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