Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f7a9481b6eed43…

MALICIOUS

PDF

73.0 KB Created: 2021-09-08 09:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 41e7987614d4fbef7fb279c505a0eddc SHA-1: 48cad2424345ee4cc5eab7cc7db1d7526d60071a SHA-256: b7f7a9481b6eed433cb2f0c7165d22ffb579d2bfb2aeb6059491c99281a01f6e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to websites hosted on compromised CMS platforms or using disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, but the structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=adverbs+of+frequency+exercises+pdf+2+eso PDF link annotation
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/83408586752.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///25452399751.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/makudu.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/b23cv16i6tadh6jv95089tee53/posato.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/wunavovumisenulukap.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8d45490c3d---36182289739.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/zixoxisepapikifu.pdfIn PDF document text
    • https://alyansdugunsalonu.com/userfiles/files/30206300437.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/sexirekenizom.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/77715362439.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210819042328.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/a620hac144pvgekfcmecb5o4ve/81906771817.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363ef3ec560---jefumufuv.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/mufiwixakiravibekuxapemuz.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/nvqu1edadt73qkg64s0rbqq760/17842569805.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/sipazafupu.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/kinotobelenikifawire.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/navikifaxigibis.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/7e113da3e84407843f12ec10df0f610c/lexotezumadixafakafixo.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f64ba1df6---vibugivejexifixik.pdfIn PDF document text
    • https://bbdirect.com/ckfinder/userfiles/files/34335301916.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/pilageriwivope.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/39913909223.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_off0000b973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB973 16888 bytes
SHA-256: 08e12ac87a401926bbe000c127a8a87c57538d0cfe570aa2281a0551f2adc04a
font_01_sfnt_off0000e486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE486 11076 bytes
SHA-256: 6c2361c4fd01d29920d7eb1b34d6a24b165e12b9c2d7a7bcb930c772bd79c6f9
font_02_sfnt_off0000fe20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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