Malicious PDF — malware analysis report

Static analysis result for SHA-256 361e89e8eda075ba…

MALICIOUS

PDF

79.1 KB Created: 2021-06-10 10:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92876f70abeda26914412f27e6b932cb SHA-1: d601ffe0d14639ba98952b967243a32f24ac0808 SHA-256: 361e89e8eda075bab86669128cacf34f808ff2e124a1826f0dade3ab82f07edc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document that contains numerous embedded links, many of which point to compromised WordPress sites or disposable hosting. The links are disguised with a 'baby height and weight percentiles' UTM term, suggesting a phishing or scam lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://archism.ru/uplcv?utm_term=baby+height+and+weight+percentiles
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608691c027679---geberaxeguxega.pdf
    • http://adabaskimerkezi.com/upload/file/28810183179.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3239c6c3f---noged.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bd858d4c819---xozebavugujaveji.pdf
    • https://villatoscana-pi.it/userfiles/file/paxatuwiwujupavos.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607222919f477---26118214435.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725f169fdcb---lelim.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb036258b5---jozozizi.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8c47d0441---vitujeto.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee66817238---talibarutotapozewobaxo.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd3ecececa---65409648611.pdf
    • http://romanakladatelstvi.cz/userfiles/file/fudobo.pdf
    • http://xinyaoqiye.com/upload_fck/file/2021-6-8/20210608173053833175.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/29ccb698e2fb7b09d8190e9b16a150e7/90171153373.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f8c158880---pukinavamukojepidobas.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd75356d20---35138321766.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb73.bin
30db6fccd5c5a19d4ff25a491681e256d669499f32098086291f25dbeacd02bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB73 5720 bytes
font_01_sfnt_off00010eef.bin
8df9aa16d9318bfa5a137b4dacc01fa4a452451141ab57e2bcacbaecfb94cd9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEF 11196 bytes

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