Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa5c04ddb4fb9dd…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 06:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ce8b20ff5eb53247ccc9f177470a8bde SHA-1: b8b7c8168651e64e4fe681e99b5006a4a275334c SHA-256: 3aa5c04ddb4fb9dd189f838d8a64dcdc95d13d0219c04406b2d5ba029f57b1b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The presence of embedded JavaScript suggests it may be used to execute malicious code or redirect users, while the link farm strategy is commonly used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cructi.ru/uplcv?utm_term=you+can+hang+up PDF link annotation
    • http://okmarin.ru/userfiles/file/25401979188.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/sefadu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/69323765107.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/paridazu.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/karutupa.pdfIn PDF document text
    • http://rowsontw.com/shopadmin/upload/files/12777710705.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/fulugikawavonaporibo.pdfIn PDF document text
    • https://basisangka.com/contents/files/berewurepobopez.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/29933847201.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/7jdfqinlps5qlahbc5nos8o0fl/tinekumetupuponogu.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/7563c29449ae23ec92581029106e707e/68816029815.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/mepumatemofole.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/legazikafaxaxusuralo.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/53880046697.pdfIn PDF document text
    • http://waltwhitman1964grads.com/clients/6/6c/6c9ae932573016e5ff31759a10dce4b4/File/zexobevovulejot.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/091615402244.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/30192251690.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/gesirowufogawenotapulov.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705d965bc6d---zujunusibuvimo.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890fd8b1c67---96191936759.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/6766463275.pdfIn PDF document text
    • http://bronia.org/userfiles/file/mifetevugijifulosikobojax.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/f89edf62201feea989b1bff57b7e4917/tazokutulopuse.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/58942162826.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/repigiladonini.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_off0000dd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD90 10100 bytes
SHA-256: 5bd81fce04eef3fdf303e4479f6375abd8886bfc037ddf3cbc93561c0bfdee6e
font_01_sfnt_off0000f3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FC 17940 bytes
SHA-256: 16856a1dfa3bc91a6072c4871432f5d186b41c128bff352f6bf7a13b944ee4b9
font_02_sfnt_off00012247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12247 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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