Malicious PDF — malware analysis report

Static analysis result for SHA-256 576ba1a5ea44e594…

MALICIOUS

PDF

80.4 KB Created: 2021-08-15 19:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bed497b6cc0273fdc4f2a691de1ff4f3 SHA-1: 8a9771332784d3ce3d133b88942c82873700264e SHA-256: 576ba1a5ea44e594ee049d85459ef1cb618408f64039a455e6ee4bb65cd49fc0
156 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 identified as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct textual clues about its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607918bf170a9---xateteg.pdf In PDF document text
    • http://challendor.com/fckeditor/upload/file/67268025733.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/211030417288.pdfIn PDF document text
    • https://kleinimmobiliere.lu/userfiles/files/60925145450.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/a59a7f2e2b7cbd539c22347930b66168/jufuritolibojaku.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/63341944761.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/sulexomoxizokutavij.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/midiwaridatuxokipezogoda.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/69340088831.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/87746673fd25579805623b2da0fe5376/51061104782.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26115db9c9---dujenumenejojuditem.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16085a8114a93c---22647643912.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/60e1057d8d7abe3461c9a5ce7484594a/10324076652.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/40855247872.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b62327ba7da---tudadu.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/55349877961.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d200fb6661---xopififimodetogezomo.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021052018260270554.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4c961a35---fitobamojipiw.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/2dc5028675b90cd35fdd279f6fed1509/gefosotivogezewa.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/bc1828975d5ca5501ce973e54b5a59fc/97748933086.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/dorefor.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/divutawe.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71d094d1b9---18127528101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=rite+aid+pharmacy+hours+on+sundayPDF 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_off0000d64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64D 10992 bytes
SHA-256: a89880d8be4cd0b142044fc2025f7a37e67008f28814aa586185fb63be0441b7
font_01_sfnt_off0000efb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C9 17004 bytes
SHA-256: 0859d88cd18562e9f35e0db903ed3027458c80a7e7c810b18071fcb0b8246f59

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