Malicious PDF — malware analysis report

Static analysis result for SHA-256 22e4942bdbd0028d…

MALICIOUS

PDF

74.3 KB Created: 2021-09-03 16:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c52f9cbc8eb2feb241ed656f60b7ccaa SHA-1: 92ca0e56551af77d1d9539dad69cebc5e173a452 SHA-256: 22e4942bdbd0028d7c505c400d3ace58451b9792a0a7d420efa233b1c4718f4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. The primary purpose appears to be directing users to malicious external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://krisoc.ru/uplcv?utm_term=emerson+ups+6kva+pdf PDF link annotation
    • https://gamaconsultores.cl/upload/file/24601359927.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/95322218998.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e9e681f76---nelivopesaluba.pdfIn PDF document text
    • http://aurora-c.jp/files/files/36976064203.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/redigoxavugudovubabekozu.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b967136008---remudaxovurogafi.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a827dbcac7e---16779542873.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/sepotekuxirexewume.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/883354053.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a397f604284---zejubakirimakapo.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/gufis.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/tovuvanoneb.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/30782167198.pdfIn PDF document text
    • http://jinyezi.cn/upload/misozigasavikew.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e87218b3a0---nutes.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/76276459275.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/85807719444.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/90a03176fdae4f48c793769e6833c100/79133443006.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/59449028497.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609433800f38d---80450420959.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/2e93756de71880e1b59e5b338b0db49c/vufusawoboxafa.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_off0000bd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD557 10832 bytes
SHA-256: dfd726e823930a7f4cae162a90b391a3f0a1118a7217ba3132c7c8eae1d37351
font_02_sfnt_off0000ee5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5B 17808 bytes
SHA-256: b9323eadf6417224c72ba808f5a5af435a767aa09eed5b4f01a7db40df9ca662

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