Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f07091804b8ae53…

MALICIOUS

PDF

71.4 KB Created: 2021-09-05 12:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ecd5115d5d3dbcbcf7b1e0571deb571f SHA-1: 5a866dd5aade9c4749a83aa21e6405de160f25e8 SHA-256: 4f07091804b8ae533619daab75f7c5fd8e416f3f2e836525f47e802eea5b540c
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 redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609485962fd53---gonanozasamumojuwa.pdf In PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/wizegipuvosatugijumes.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/vuwemevo.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/namarakoluzinoku.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2182ef0e81---manupoxono.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/lalapipifi.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/9265dccaffa7357ddebe1e6840d31cd3/joxefasizimojafozepatatop.pdfIn PDF document text
    • http://signauction.net/userfiles/file/xaxodemupukemabi.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/getaziwov.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/35398870696.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/73253574874.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/dopufi.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/41797872221.pdfIn PDF document text
    • https://activepymes.com/pub/file/fipafupotego.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/zonowitagetunali.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/86343ca12e8ecd8e890f2a2f398f15ec/toxegejawibujusisewi.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/wakodufefi.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/38993163890.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/daxusar.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/l32ldl80bml4qu8m7vgl835lr1/nuxamifutofofu.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/17351752769b9a3c1ff82bfbc3a9a765/favorab.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/wirogipojapaxupurawod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=science+olympiad+sample+papers+for+class+11+pdfPDF link annotation
    • 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_off0000b4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F1 16012 bytes
SHA-256: 35b519d92f30687e071fce7332d17ceca7aeeb3bc1315587b1e596291f0b1fe1
font_01_sfnt_off0000de18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE18 10924 bytes
SHA-256: 6d93f9d6aac689dde1fc4ccf9f25be37fc63e18fe1eb5f6fbec595317b4f4cff
font_02_sfnt_off0000f765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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