Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d23f281b927e3f…

MALICIOUS

PDF

131.6 KB Created: 2021-06-11 02:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 703d0ff88e66b54d61cb6e77cdf40fde SHA-1: 43c4668f66f63afc7ca1481557b0c9851284f2f0 SHA-256: 98d23f281b927e3f4e47585f245b6cce207cf9d762d90033f9d05ac1ae75b6c4
136 Risk Score

Malware Insights

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

This PDF contains a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the presence of a 'Password-protected archive handoff' heuristic suggests the document is intended to trick the user into downloading and decrypting a malicious payload. The document body is heavily obfuscated and appears to be junk data, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://chcial.ru/uplcv?utm_term=durga+saptashati+path+in+marathi+pdf PDF link annotation
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4e4f3e77b---wijakasugigonoke.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ac27c362e12dbfb512c37dd039edcbc6/98100397919.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076ca0ccb4a8---seretopodigukamego.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/5afaafce445fae1f6dfad5bc2f363ff8/nubegudev.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/692efffad867ed09d936c933d9f6bc82/nusapesipugozeduzugirilis.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d6c2185d3---12014261639.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/30025701204.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b95b9252fc6---98078380709.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e173e40089---83168405275.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d09c8c25b0f87bb388f8fae5efd43ebd/zatem.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/84168870373.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/kn6c2n3nv7cbme284bvket6gl2/dulakazabakibu.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/12590426269.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7dfd6e7b4---ludokefakugufemux.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8685b75f5d---nomasotitivafofo.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/16614996613.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/18551276224.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0001bdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDC7 5076 bytes
SHA-256: e5e3db2879566b0d3ddb26952b02398ec79ef202b3bfb8f10128d34e918c9f68
font_01_sfnt_off0001ced0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CED0 11032 bytes
SHA-256: b343bdd14528a2e07b4c8203aece6d62bda07e14cabec4d0e03e9e8234570ab3
font_02_sfnt_off0001f435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F435 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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