Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fafde76f54eab1b…

MALICIOUS

PDF

81.0 KB Created: 2021-05-22 13:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f80fe47a3e3c890d1f664428592c83b1 SHA-1: 57a78b23358ec95203ca4527add87b227d317a14 SHA-256: 2fafde76f54eab1b3bd052851a582ddbd21a55cc4d4c08e92be7c7ac54de254e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to facilitate phishing attacks or distribute further malware. The presence of multiple links on disposable hosting and compromised CMS uploads suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f8b920cae---66120275619.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160998882a4255---viwitafo.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0978c3fa9d---237494887.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609975ed653ba---zakonebijiwudaneboxega.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/sgj66iv6kfk5sllk1t2uuem4c3/97999769429.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0tc8u1e71o8mn0fat6qdhuiee0/zuvipuzama.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/11a5f05641847073788e195d03fbcfdf/bobelufegelavuvuvupudi.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f85ed6a56---bobukaneluxozajavelu.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16099d867bf639---wawokapunusatupufurer.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e58c68fe2b---47833517642.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/b0a5f503a5531d7c5efc74206f1dd0cc/mofepimavinobujuroke.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086c9007c85e---89603464302.pdf
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/is11en2vumcsgmb298137b7fsv/witojidex.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b3ce6ce1---guletugikofusofunumudop.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851c5eda924---lakimivaviwazomep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+sensitive+is+a+rexall+pregnancy+test
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010094.bin
3282583f046f8b2362b2da59bfdbc45e1c028fc8ff643ddde2d53848baa75889		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10094 5384 bytes
font_01_sfnt_off00011315.bin
af8c9af074b3508f8419b10810080c7bdbcc32b2947cbf3b9786280000ef9cc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11315 10340 bytes

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