Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b6258fb5c56c33…

MALICIOUS

PDF

81.5 KB Created: 2021-06-24 12:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 90f3b91b394345114e32cf8c824446a9 SHA-1: 750e32c28ad653f48d71ffab85e4e3f0424698c6 SHA-256: a2b6258fb5c56c333884b88da22ee3066d5ba4b1f5fb86006b84320d7d3680f4
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The document body, though heavily obfuscated, contains a reference to 'download fifa 20 mod offline for android', indicating a lure for users seeking game modifications. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this phishing and distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8468

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://cructi.ru/uplcv?utm_term=download+fifa+20+mod+offline+for+android PDF link annotation
    • https://kozhikodedeaf.org/admin/my_files/file/lepatogarelimimepasaj.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8fb5811f3---77666525323.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/e4abf65607f6332ee07999bca7682ed7/37211582483.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/37617227256.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/1a5f169ab3148e88ea29591fc58c0411/58482181882.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8ddac11308fb514fefb8eba0b14d852f/56757654781.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/866d1f12b8efa90506a0abe91913eb4b/31432603385.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080223d1c288---70447866517.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/gopetalej.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/29599422936.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945ffe24407---jibalabuponudevazabele.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/pilud.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/8nimnrclv49djub3bs80ejhmqr/niwibaxatebutogisozizakaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF66 8964 bytes
SHA-256: 0befa52d2b0924ab03e9b22ae57f613eb2b5e6db740032a1a530afba92fbce03
font_01_sfnt_off00010c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C82 5240 bytes
SHA-256: 55bef3eb10567b323f70ea632d832a05bc1d308c60a5fe808f977b0d6b951820
font_02_sfnt_off00011e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E59 10812 bytes
SHA-256: 10d6c431f8c3858278ff45cd5428e093bb871bcf1e9b0f6003a32ee55182efc7

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