Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea0733424a79b118…

MALICIOUS

PDF

88.8 KB Created: 2021-09-06 08:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0763a09725e025ba9e25bb7f411a214c SHA-1: 622d30e2e35db22ca9f05e9b70666bb5617ba171 SHA-256: ea0733424a79b1180351f80a3c9f648fcc6dc0b2033ad04ebe39b0a143e5137a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ketchas.ru/uplcv?utm_term=l%27essentiel+des+relations+internationales+antoine+gazano+pdf PDF link annotation
    • http://archinfo.ru/uploads/file/zujaloxibosabexono.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/ruranititajejin.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/vivagologofug.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/231304595164.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/14175523413.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/26461992654.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160784085ed13f---puvodewali.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/1a64882143a1eadcbef88cc768888e05/57153217565.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/fexugemexukere.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/e1d8dc8e93a9f0a3955dfa0d7798fe7a/51861049180.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e1b3a4e8---71807085439.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/pj8thdl7usr6a1rp7v6vqsdu44/16710975383.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a271d7bf5---40473812129.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609798972512d---57748763963.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/6d694ebe0e98add8a3b6128a3961d30a/21323338970.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/nonijudegufures.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/bubudesu.pdfIn PDF document text
    • http://ibb-online.ru/f/file/bokupilefufagid.pdfIn PDF document text
    • http://labotinnghia.com/img/files/51345684302.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/pezezorufebobisasedem.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/94175673416.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/78083505767.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/3572848658.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_off0000ed65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED65 20864 bytes
SHA-256: a37206732c24e977a42832534fdb674d83c85ce77aa9b888f3df263478c79041
font_01_sfnt_off00012283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9A 10724 bytes
SHA-256: e866f9f621da3d77a012eda43d4a6df91182f189463bfce3c2960920227eb8a9

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