Malicious PDF — malware analysis report

Static analysis result for SHA-256 05413dc6e1fa1d30…

MALICIOUS

PDF

84.8 KB Created: 2021-06-28 01:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e700ec4f6ccc98ec3151bb40e7d75e34 SHA-1: ddde884c84a1438d7dd68745bd830e8af87b2aea SHA-256: 05413dc6e1fa1d30aaaf7615610dd499e43eb59fd851e19116e5c40f4b68f7cb
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on potentially compromised websites. The presence of numerous links on disposable hosting and the use of 'utm_term' parameters suggest an attempt to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=kings+college+intercalation PDF link annotation
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/uhikokf1ps9gtrdkg81oqidqo7/75374488886.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac053ee813c---gokobusuxas.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/gekesudarabusimotisonebaw.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/et8560l9u80tr8dblj5rmdnbh0/waxakagajebafasuwutiv.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a413d03cc0a---56780055100.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de660ab7a5---saferutuwox.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883fddb4162---sigutuzefelijagojeserevig.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/fivedafodubiweboletuz.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/on0drod6j5jplsq7ku81g7t5de/95335767602.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/19474775124.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/80ab38155734e15ec46f8dae275c0455/21777316668.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/75352859973.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/kobonemenixuzutaras.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/443f87af6b164a709e58b4cf62f84497/47490151731.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/3ffd78a70af333b27bd8b848b5ee57db/62271274877.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912a9650f30---botewizososajuronanes.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608014d35a758---95070575062.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/d552a5b2e4f3ad891e142b728f402378/sujunufutabadif.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/bofukovesugararefozogi.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/mavuzewokokizisazinaxu.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jaluvofijifatetogujodulu.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce17d40c7d---82815491339.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/29f75443574cbd6aa23d972897bfcdb4/56144187788.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/d3596d56aa63ec7106b59ecd33af6586/pofafuvexulod.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_off0000e94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94C 10396 bytes
SHA-256: ca635631a52bd3565ffb2cf8da3209f1e073af2e7c48cf013876e9778867a650
font_01_sfnt_off000100f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11908 17220 bytes
SHA-256: 3bbdb89fa5ef12ae92a9b860a53eec078251a2fe0033381f38a077157bcfdf68

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