Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc2fe5536d8a413…

MALICIOUS

PDF

77.6 KB Created: 2021-09-15 05:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bcc5a2d7cfed5981daf26fe2b879ebf0 SHA-1: 2666e1d0b4c5894610369bf686d1b75f777f5957 SHA-256: cfc2fe5536d8a413ed59eb0a1909a833964cc51c6120c1383eb0ec528a691354
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The presence of these links suggests an attempt to phish for information or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://smidgel.ru/uplcv?utm_term=how+to+play+with+a+friend+on+minecraft+mobile PDF link annotation
    • https://palet-school.com/files/files/46508804734.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/ec7688baea719f0807bdb46265835031/76148161175.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/rupitorazi.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/161332e83cea8e---rokamefoxez.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/56798957437.pdfIn PDF document text
    • https://olterus.info/contents/files/kubafipinuguzikunis.pdfIn PDF document text
    • https://satesayap.com/contents/files/9180996616.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/feripogubulidos.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109050510125544.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/zokabum.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/52188326077.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/55e8ce1dbec81d7664ecb21fdb12537d/22169485033.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/muretoki.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/3400519012.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/87924418757.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/gajel.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408f266c2ac---kezexivadikitujavomeken.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/98813961978.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/xobugedaf.pdfIn PDF document text
    • https://atiksigorta.com/files/niminovoboza.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/94137366895.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/fonixos.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614113c263047---sogimixedowubawaba.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/wixibaxiwokarozajonawowuw.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_off0000cb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB47 17012 bytes
SHA-256: e3263b0489de8dab0c41beb03851cd8fac0c934055dd9f586cba21ead0fbb976
font_01_sfnt_off0000f770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF770 11048 bytes
SHA-256: 84d4af2b88632923e07fa445ccf9043df05462f8b18cfadcceb365546c063ed5
font_02_sfnt_off000110bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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