Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c07df047b1de0ed…

MALICIOUS

PDF

74.5 KB Created: 2021-05-31 03:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89462c0854c2093303bfbda4d856d85c SHA-1: 8118461317eda8a804bed62a1d59f332e760d711 SHA-256: 2c07df047b1de0ed33ad4c1e89baae9676dba2500a8b8526972ba7f3000611f8
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to host malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a spearphishing attachment used to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9535

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://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608146e786be2---39084684425.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d428192c95---86038212005.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/dc203785987086df2882a86935606047/58220158858.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867799e4198---42634559465.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/t3qbpnej82c3muclib2duti6d7/74470274723.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608683dc71d54---walaxegowuladus.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e1340ac42---xejidekebigiduromidoju.pdf
    • https://alatheir.com/atheirwsfiles/file/xakebasopufukuvixul.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcbe1e26d9---43372922307.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6cb8ba553---6696089617.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/q7vmbgpl64u26bsrgr27l00hcg/4566699942.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2706e5d79---berunuxeniliweve.pdf
    • https://kham.vn/userfiles/file/javanuzaluterugodag.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/55b514ba6901eed68775f48a27bd9e77/durafuwuluvapavinigoduz.pdf
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/0f088305c6fd7fa07c10aa8a8aa5838a/janiwedisavijabipajirub.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42b8e56f34---dadorodomawajilu.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b051da164---80319730115.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=what+appeals+to+you+about+this+role+example+answer
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec7.bin
eeb3472cd1dde103d0a3559cb68023eadd6a84dd491e6363d6ba545b8e7a4afc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC7 5472 bytes
font_01_sfnt_off00010153.bin
4fd7b31a5e5941576363f27f3daddb03b6e109593bdc8020e25f5b362077f038		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 10508 bytes

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