Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ad94582e09ead8…

MALICIOUS

PDF

86.9 KB Created: 2021-07-14 04:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5f630008d9f47b983bca55200a76900d SHA-1: 05ff1e0701364c14f89369280a419bbfe8beefd9 SHA-256: e8ad94582e09ead8398ebdc4ad9c6c01574e17b6412ea410a6b477c7ead08338
156 Risk Score

Malware Insights

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

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or redirection scheme. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bursakaynak.com/userfiles/file/pixigenirilov.pdf In PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5331cdcc2f---514881543.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/8bf0b93bd7f07f3c0afe98d901eaa7aa/xujubixuw.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/76930189764.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081eb7ef1a00---33423170047.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/4829c1383f14b6a32bb974745fe76563/valatafasamunaxaxedan.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ukrejrfso07805l3d0omkj9v4g/fiwupukiwi.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/4e3bee2a968d5eb5d378b4c71dea67fc/dadufaruz.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/21332435896.pdfIn PDF document text
    • https://baptistfriends.org/media/vewete.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b574f0e13---wigused.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/47296208730.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/rutolexegukofelopife.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/dovuzosixobilaw.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7a40c776810d0d4e314e629d620ad4a0/rivojizopotezepuxel.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/44255528805.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/2331432995.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2806519eb4---43192977766.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/b0b40c1c400f1e26fa2f865caab0b878/71978124063.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abf5959f08d---kubufigakig.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/fukuxuratibatorij.pdfIn PDF document text
    • https://reniuved.it/file/mutelapugajaf.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/86672017526.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160834e36dcf1a---tofogumak.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210614_100170E29A4251F6.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=logo+quiz+all+answers+level+1PDF 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_off0000f224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF224 10652 bytes
SHA-256: 1683329eec11d63248f8681c77641dec0b1106fac30a6acbaeee28a80c6d2fd5
font_01_sfnt_off00010a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001228d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228D 16824 bytes
SHA-256: 7b3ced4987eb611f13938064d41e01d76d6127486cb90d4ad403d223d53b466d

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