Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e79a98a596c0d76…

MALICIOUS

PDF

76.2 KB Created: 2021-06-10 11:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d06957d575c50673430a37bde6de7fa1 SHA-1: 7cd865a1fd2f55fed4bfb1a48f3c7abb544d64b9 SHA-256: 9e79a98a596c0d76b69efb0d2618aa2aa465abd1b5b922cdf41178c22ee6f528
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'competency based interview questions'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://chcial.ru/uplcv?utm_term=united+nations+competency+based+interview+questions+and+answers+pdf PDF link annotation
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/67b9d21a5c25ad9d3471bb9664dfbc2c/22947442021.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2279a85aec---zexil.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac25af16077---99085940895.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/fbdabb8a8251218798c5dc46314a7b6f/tadunumenivikijojiwamixi.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/kujevaburijulegavozawi.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/7inqb5b0vuh6hqijrb3rb8udb1/tokuvenanomelazibidut.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/f27f16e5f4bb6920f121ec9d3505a1fa/73293040098.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608657df745c9---83987041352.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/20145993377.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789f008cd45---buberuramifuzikavogeze.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/bbd44d9791b5f5b2186a29b218ca34bb/41567427457.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/781899d429519b9f2b7c6238567db812/tezekezexedifezu.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/xobavuwifejiwimikube.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/cfed0a60dd8ffc3cf5aeea3da4a2f012/tisalexusa.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/aa166ff0486a68c7657b541cecc8277c/wafilasule.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/gajukolamuzokezira.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 5780 bytes
SHA-256: 83e5c36c9538e6b982b1c6108da04001ef361af0a26154bf2eb11789d2cf99a6
font_01_sfnt_off0001035f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035F 10772 bytes
SHA-256: bc42d98415fd162b185531444c7f9062576b1d98e40426285acf9f446d2600aa

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