Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a73cdb777bc80a…

MALICIOUS

PDF

85.7 KB Created: 2021-06-26 11:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 756f92552a84865a5db0f03aee602563 SHA-1: 53190d15d532174e1a3edc6b60b1bda983c38eff SHA-256: 17a73cdb777bc80a0d7cb4b6fd7c914b9a3541b76f730c3d96585cb5ab9a9e89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the structure suggests a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/f17b9de6366334b2fd87e4dc4ed675a4/rufukasasaz.pdf
    • http://watthaistuttgart.de/userfiles/file/16523909403.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/ql7c4shkdu1r1j0rpahtcb8o82/80000998159.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f92518046---45098747282.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2f3b26b85---56278963813.pdf
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/5vg6rog67eh9nimn4m024hh3i6/50301083565.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/f605328b0c2d6794ef06d2338f9e5de4/zotopikosabalupimonuke.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcba6812f5---59316664427.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/698eb2e5fc997eff9adce79b3c57b5a7/xalodizurokuraxedekave.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/zaruxefewalimov.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749207f2a66---63713700078.pdf
    • http://tatishev.ru/admin/ckfinder/userfiles/files/bupopo.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/0dm3ee1tt6ftpgo91q6f4rf6a1/67495115402.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160715803ddc57---lepirokumuz.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffe4c6f901---10134852120.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/95096690b5fc7fde0ae76334ae8bbc4b/xagefutowegefuxunep.pdf
    • http://hilltop1976.com/clients/24685/File/wusetivevok.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609442ac00e34---jezuvetovibonuzebukikofa.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/2a561af4b7ea3eea32ec76cff07735b0/58504632272.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958efef0d6e---reseguzejubilusese.pdf
    • http://www.urbanwaterways.info/files/vefedelusikilujol.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/a3k75e32lcpktrvrbvia12ibl4/3382565115.pdf
    • http://10glazsikeyrosa.ru/file/48328044119.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=mrna+is+involved+in+the+process+of+protein+synthesis
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edba.bin
689ff623cc8d1d2fb01c02dcf9f261f822261f661c42eda2e582aa8e45928c8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBA 16392 bytes
font_01_sfnt_off0001182f.bin
ed8e63703945c7d4db266a43a0829e1c42a5c4b2afebc4f6ac4d5b3a52b2bdef
pdf-font-stream PDF embedded font (sfnt) at offset 0x1182F 10888 bytes
font_02_sfnt_off00013159.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13159 16792 bytes