Malicious PDF — malware analysis report

Static analysis result for SHA-256 06d677b188785571…

MALICIOUS

PDF

93.7 KB Created: 2021-08-22 02:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f4ef2fcb1a047f375701b7461067cdc3 SHA-1: 36746fa13a3bd8fcb6070172a52021cf931eff91 SHA-256: 06d677b1887855713b1f40555dd929adc7d6d6e50ac68b287eceee6af8505973
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous links, many pointing to potentially compromised WordPress upload directories, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to malicious or compromised sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/a98febb2545f1522d8c0495bce048a51/kovowuwefugevofeg.pdf In PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160bb55e4d7e6a---valawuvewedidopid.pdfIn PDF document text
    • https://anakmeong.com/contents//files/6735747907.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/86infsn3qh0foqhn8lcg89nktp/10701357701.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/86381781604.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/loxegorujalewu.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/32384866107.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/ff9c829b3949be195e7c48d68f1253cf/67242510361.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/sonazodozasonewadagilixo.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/f39bp5aja2ogsjfdmbj893ugc9/50542509803.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/m9nq7ej2eqkumlutjh734t7scu/volinidebadiwinu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ktb16fqvvv32eof9p3ba0b0pq3/91598734421.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/f15a42c9d5c2957c7341db9ea726d2a9/molijijopen.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/wegugavirewav.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c210df9c794---21618690740.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/11377423297.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160982d65d4b1e---gagovezikusakegix.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105190419185875.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/tc7mftlecugtmdr7vui38kbf8m/juveritudo.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/95329001222.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/jazilutefudewobinulib.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/daba321009c3e30407d4f3a3364c24c4/nisaruwilutij.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/29903176002.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/12588354585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+to+say+to+your+parents+on+their+60th+wedding+anniversaryPDF 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_off00010903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001211a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211A 11272 bytes
SHA-256: de34affdf79170a17969fcb43a3553093db4015cde7435f19e8d80cc300fd102
font_02_sfnt_off00013b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6C 17072 bytes
SHA-256: e63bb45b30a15c0d6f8225a4718bdc8a7d55b25a9ba9b53ca44ae5c9a5878912