Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc72b1fe4586656f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 07:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6093c85a7db6349170a658876a69d059 SHA-1: 6bfb4a78e9d980db7920c5f04bfdec08c6215ba3 SHA-256: bc72b1fe4586656fc7180b77bff3ea4ab74eaf19d90714516248811fb39a8282
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded content, while obfuscated, are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://chataphan.com/file_media/file_image/file/99047334283.pdf In PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079c3588a41d---lalapenoserujujided.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/nobamutepuzurorafaxazu.pdfIn PDF document text
    • http://goref.ru/files/file/xovukiwixidawukuwoti.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210729145845137.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/sewojofegemufax.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/30434803173.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/xotapa.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/zizifelivigifakamo.pdfIn PDF document text
    • http://termocity.by/pics/files/goxubelinigakisonezidi.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/bffudp2gl63760n4p1uk1lpcu7/gefef.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611d058d6ac4f---sizuweveravevalaburud.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/qa7jb3qhf4le90v6bp3245hibq/37781572758.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/64489872967.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/tv7pon3r52oiogohkie57pdm60/53667681399.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/8d1dbab9797fdf9d25fe2b01a0c0bb6f/gajinimololawonewomavine.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/18382200589.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/859193420.pdfIn PDF document text
    • https://avenue102.com/uploads/file/panorevekabi.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/puvededalumigunax.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c7712d49f82---96593946542.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca7f1d54513---5420056813.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/vasegojevunesesamivane.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/85214965005.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/reziworavimufofelubu.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/4227d75393138ddd6891a321ad86deaa/sopetulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=mcgraw+hill%27s+conversational+american+english+pdfPDF link annotation
    • 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_off0000d731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD731 11248 bytes
SHA-256: 304618e35a19595fd383fb9ee96b64a5318fe8d8e838e4794a69e864f59a8719
font_01_sfnt_off0000f14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10960 17924 bytes
SHA-256: 6f3698487a198c09f885185ad777a6064700e6c5bfd5390d538958c8183ae7e7

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