Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c42c62d8b19a624…

MALICIOUS

PDF

71.3 KB Created: 2021-06-05 02:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3534b71f731b333432b2683ca3cce60b SHA-1: 7b2c4d63eae5cce784403f144ad9caf24cea93b1 SHA-256: 8c42c62d8b19a624733a871c12b4130b6e583b9dbda4953e61c11c91712fbc53
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9544

Heuristics 5

  • 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
  • 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://philabc.ru/uplcv?utm_term=telechargement+music+mp3+gratuit+ma%25C3%25AEtre+gims+-+contradiction PDF link annotation
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad54aabb342---gibiximagojivupeloxuxepi.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/0b8717db02a3d49d807972cab8eefd89/13206552016.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/234c1f98c98dc9e190bfb476eba6a576/guwonugusodorugofemuka.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/5704jpe84iimht3r92ik81gmde/2488656056.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/b3ec884118c51e7e3fd945d120f86c7d/41678210640.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c944912a8---1524511631.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d109529393505fe80bd11c8c3c9898e1/gagipegegoleruruvomoxa.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/233308094.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/4d4f05e3453a582d30fdf47ba0828094/29266410081.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/11278584912.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/rivedinero.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/8ef28624424bba7836290c23aa13adb3/biwavurul.pdfIn PDF document text
    • https://agatanorek.com/files/file/sekufukajuzo.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/871dee08c2d74a79cee3623551d96021/84268981838.pdfIn PDF document text
    • http://debden.org/userfiles/file/bumozakipegarafofo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00010d58.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10D58 12343 bytes
SHA-256: 235f8797b666e9c07a543b9b594a80ec21d119e86b2fc862abff1eeb27d8b78d
font_00_sfnt_off0000cd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD13 5692 bytes
SHA-256: d934318496e967cd7e84dc0097ca20b30a2ce2cbd475697ac5271c80531f5217
font_01_sfnt_off0000e04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04E 1888 bytes
SHA-256: ac14972b7b2947834c866a693307dd83921f9e40fad0e2ab592cecd13463aa54
font_02_sfnt_off0000e961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE961 10444 bytes
SHA-256: b033e3e6decdd85258863eaf6359399096abad12dc62e1cba21c00f68055b5bd

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