Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ae1d6486530ac7…

MALICIOUS

PDF

85.3 KB Created: 2021-08-03 21:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c7240534dedceb203aef719e604372cc SHA-1: 2000295676858751ebde910ca3d620980e3ebc4e SHA-256: f7ae1d6486530ac75324d8ac42b5f1120ef6be41595f3dbb7f3e4707c5feeb7e
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a visual download button lure and numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to trick users into downloading malicious content. While no scripts were explicitly extracted, the nature of the links and the ML/ClamAV detections indicate a high likelihood of it being used to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://lhsclassof68.com/clients/73441/File/50864753753.pdf In PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160713ea64244b---58893041271.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8a03b6bc8---ganitisodajozotinago.pdfIn PDF document text
    • https://flyags.com/editorResources/file///86441450361.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c14fadfcda---93173886886.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/487b1dc6370c9234757ed7a8b842c908/pigexofiw.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/87cf552f7072769e9bc388f069bf6707/9138061648.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/nekixinejijatagavorewoz.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3c9f4b259---vomoparatatil.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/76992092009.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/87966489956.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3146f7358b---58257233115.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/604c2cf1ae9e465f348f4bb4dcc9be28/83568996518.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/655e103571a91140253d17a4266d31d6/sorarufijedomujup.pdfIn PDF document text
    • https://cncunse.com/d/files/38129982922.pdfIn PDF document text
    • https://777mto.info/contents//files/vifikofixiv.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/lujezamiwidapina.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/20903070602.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b1007144083---26551124008.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/katemijasa.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/b298daa42089bfb728aa141db6d85457/59635094797.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021071304451681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ncert+class+7+english+honeycomb+book+pdf+downloadPDF 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_off0000e828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE828 16932 bytes
SHA-256: f79a5f24483a696ffd4dbfe862e91f913602bb533f3c732e3ab2960cc93b1505
font_01_sfnt_off0001145c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C73 11528 bytes
SHA-256: 002403266611c561734fc3802363bdf8ae1796464944240b988e562ab9d0af71

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