Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb882eda9753f33e…

MALICIOUS

PDF

89.2 KB Created: 2021-08-08 14:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 1502d1eec48ed67b348b2b89634172c2 SHA-1: 27ee7c2b3488a750345762f519535e1a836d4a49 SHA-256: fb882eda9753f33e7188e9cbfc8584aab3180a6bddad48542fb4ff875d18a456
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crysiq.ru/uplcv?utm_term=circle+of+life+2+part+choir+pdf PDF link annotation
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/so95onoq2httof99jruncrj414/48569475510.pdfIn PDF document text
    • https://windsbs.biz/files/file/buvivagazipopopikitupoj.pdfIn PDF document text
    • http://twilaw.com/files/files/wimaderipelubuxurivumu.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/mijekuluja.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/rogidep.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/h6qk7kcr82govemtnq01q3i03s/xakuluvokagulebolunev.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/bigafapobofelut.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/fugibijajutizupanoruwozu.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/46500414915.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/maxubilebumemoxapojubes.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941eee613d0---89655872513.pdfIn PDF document text
    • http://cuiquji.net/d/files/dasakezi.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c994530e63---vomonuzijagenijeputeme.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/tupejiraradodaxojefodo.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ii5ksmquu5sfpju860mr5eqbvq/lilexafabebapoxirode.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/widezuvukupopuva.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c10449c45---67264054194.pdfIn PDF document text
    • http://myredm.ru/uploads/file/73478068850.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-20/20210620112131538941.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092abf65c65a---garofi.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8dd5e64933f5a075ae01c9242c98d03a/63083628950.pdfIn PDF document text
    • http://omg.su/upload/File/75692883357.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a33fa4fff4---50255738433.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/85ce00569adbaadbd23d51b4d6872574/pexexufi.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF809 17348 bytes
SHA-256: ab64e464ee11e1d37239c5e45393c2b356aa7c609957dbb54cb948a94b819918
font_01_sfnt_off00012525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12525 10596 bytes
SHA-256: 158603692e66687dab7ce7e02c88a3bc16c9c1571af8b0ccc75a940b9d50a054
font_02_sfnt_off00013d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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