Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f6355dcb6c762f…

MALICIOUS

PDF

87.4 KB Created: 2021-07-06 22:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f52a6302b8579f6f41c581ea477e1414 SHA-1: 739ce136b00d9e7fb6388f86211391fc3c6721f1 SHA-256: 68f6355dcb6c762fce479e7c57c04bc32471e8d1a7abb2c00a07cdd1943b6547
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URLs, many pointing to compromised WordPress upload directories, strongly indicates a phishing or malicious content delivery scheme. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=fulton+sheen+50+year+old+prophecy PDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5ed513693---95810404282.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/bb92cebbd2e74dd014bd74a5edc6409b/12509930160.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160def1b7273e3---woremokojaxigilumegun.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/78709772010.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3c7cd42599dd80cbb3a3bc09ec8d52b0/gedejilofijapazufi.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/simabesav.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/sonebudolutugol.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/51i7ffcmqd4i4leqbffp3aj2j6/87888995755.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aff2bb7f8f---60811160204.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e33669182fa---16046707442.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vqh556iv8c1dd7dvbdu4319ee7/lubobojafojesonok.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/f5216b4e39162d85c52efe9d5e6739ad/xurufinumon.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609487b00be7f---71433876020.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb0180c828---rugizesivu.pdfIn PDF document text
    • http://planetamama.ru/files/file/45947049182.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/19393519478.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/d5f4a89049373a8da3f5d9fa4d8dc395/sodabuke.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/46909337090.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/cf3ce937ead0336afe2701cfd5595ee2/fopozijiwesuri.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1606d884ce9768---2321360754.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f760e4d0e03db1acdd9adbef5e283d6b/28487296639.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/jagefudo.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/21694021677.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/589316032.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/47p54ss16q8ucufls7jh6jfsbq/48866718844.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_off0000f18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18A 16936 bytes
SHA-256: 09e620c0951d6e805b8d8fbee779ab193547bffe6991105b823ce749e9ed34b0
font_01_sfnt_off00011d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D29 10964 bytes
SHA-256: 5b58377085ade141cd1a22e62b92f28ec70472c06b4555ea0fe00d9b26d5a0d9
font_02_sfnt_off000136ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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