Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5a0b02bb7816cd…

MALICIOUS

PDF

74.8 KB Created: 2021-05-26 03:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a91f1d43b1bba8fba8308719149e136c SHA-1: 548afe0ca711891362a3e3da088ec5882d4558da SHA-256: ae5a0b02bb7816cdff8561953ab32234886648b0efac32d6a18cc6dc700ea29d
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The embedded content, though heavily obfuscated, appears to be a search result for a game key, which is a common pretext for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9211

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
  • 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://laborke.ru/uplcv?utm_term=how+to+check+my+diablo+2+cd+key
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/4a039j2mu1en185l1j3jif3oq2/dojurasiserafunevoredul.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607db3ec7053b---jigujojazojufages.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/3123c0fdeec4c67107afb5867a6aa360/86369897139.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/3cc5597105e1476433c761d360bb8caf/manefab.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/2jtmrcsas73t7vfr9ecm76u6vujqibdn/linarogapifewipuxerut.pdf
    • http://bannermaul.com/userData/board/file/51785201673.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f843ce3113---20953349999.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078f3a052dce---kexorusazegumutunuzo.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/gfr6pio2v61445cqsitpnsasrk/ramozit.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/0a818aba30e51c5a01a3ec4322fbfac6/wovawix.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607712c6377f5---refus.pdf
    • https://peterdegendt.be/file/34329159233.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/27bc366bb71e5f7c4252c586b71eca59/45748264417.pdf
    • http://lycee-elm.org/userfiles/file/rufax.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8e2b74ff3---lijolufemarumupud.pdf
    • http://banghetretunhien.com/media/ftp/file/51927407715.pdf
    • https://soudurelauziere.com/upload/editor/file/41212402905.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac9f128f97---72745220817.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e52f.bin
2fdf038e75a17122e2533cef4e69e30521048975d06a1772486c7d298a986311		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE52F 5080 bytes
font_01_sfnt_off0000f689.bin
6ecde7356a712105702ea2b50da8d5649ff72f82b0bf629ce4f221595e36870b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF689 10816 bytes
font_02_sfnt_off00011bae.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAE 4324 bytes

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