Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8b7a482a035c94…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 10:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 64acbdf6570a24909f234fbc3ce68b66 SHA-1: 934af28ec9ef7204ba4d0e15a1f7e0c0cec21062 SHA-256: 0a8b7a482a035c941cc8c3c9a0407e2af8338d45615074e3bd5c8c96040d15d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that function as a link farm, redirecting to various domains. Heuristics indicate these links are often hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=ad+pattern+lock PDF link annotation
    • http://apvn.info/userfiles/file/5896247611.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/71533220653.pdfIn PDF document text
    • https://thermaltrailrace.com/imagini_ws/sowusopevogipab.pdfIn PDF document text
    • http://sanaspinler.com/calisma2/files/uploads/21650100798.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/92338670366.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210917232747_sn00z1.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/fomalanifutikiwaf.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/tajatexenupi.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/57876454550.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/70607832050.pdfIn PDF document text
    • http://brlairport.com/images/file/wogabafukagas.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210912043639.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/19304264312.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/wulenedaremuni.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133a6138132d---82309896762.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/mefomos.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/a69428b1211247b4cbbeeb49eff5e066/rugesa.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/foxelogokagagavonavo.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613773a25e790---61027504212.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/ranijinedibaxudibefug.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146a792ef2c0---bavizejeluxuruxoro.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/repug.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/puvikagaxiwiminarofunagas.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/95004715947.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/vujuluget.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_off0000e0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 10320 bytes
SHA-256: 2f084b0d6aa762465c40103bd25b2524e1402dcd166b3e407fab758faabe08b7
font_02_sfnt_off00011031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11031 17384 bytes
SHA-256: 6e57e52f8b29bc597ee6e5a4d9ca4c7de8151158863ebc52f7fb6af93dd0b3c6

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