Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c4a62c243f6dff…

MALICIOUS

PDF

74.8 KB Created: 2021-06-20 19:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 23fcb9f77e8e42e625e4397ce0ab2936 SHA-1: afea6a0a009109053b521b97087f23e0d52fffbd SHA-256: e7c4a62c243f6dff05f72762acdc3dee720738fce0cdbc780f8ed1fde1c1bdf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to search terms and application metadata, which are likely used to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://oniceh.ru/uplcv?utm_term=dayz+how+to+craft+crate PDF link annotation
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b793f2d95fc---81291218009.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile/%5C/2021042900083726.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02e1b61221---kiretivegegubexamoworur.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160812e5d10db7---fenixosomililulanive.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/b5dla9ng6clrocl9ng65vgmh64/27424341844.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/6fdcc1247976895dd4e6a756015c69bc/87654787895.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05a8e60b49---18535747948.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/dexafadatutixukuvixepisog.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/82383556015.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/53262182899.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/2b7109877bbb555ac372815e9659b0b5/tomoxuxawowanofifuruwu.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/lutorexukokemazogu.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/55976751204.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa06fb47b0---67877783506.pdfIn PDF document text
    • https://isleo.com/i_photos/file/batenolizekuzudefi.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/3ab0d88336de5a66a02445cc002781bd/10970808057.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/zasifavotabiveweru.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c24c9b254bc---34112022051.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE629 5004 bytes
SHA-256: be4654852f2269dc4942b1e804cb3eb5346f17209270f4b330b7d63184a0207a
font_01_sfnt_off0000f750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF750 11332 bytes
SHA-256: bc0889bc9777e9be9eb3b7c4d346b862188d9fd1372cf48fc676581def5bfd65