Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d42f9548c5ab022…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 01:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 916693780785ae3f5dee187eb0c97f1e SHA-1: 82176792c6220b3e5f4ba5cf88a3da3a121b2bf0 SHA-256: 7d42f9548c5ab0224f1dafd0988423b05892179694b7ba690c87fced8704d9f0
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple disposable hosting domains, suggesting an attempt to distribute malicious content or conduct phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using small PDFs as link farms on disposable hosting, further supporting this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://masterkontroll.hu/ckfinder/userfiles/files/tigiteforov.pdf In PDF document text
    • http://kartelabasligi.com/images_upload/files/65634729848.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/mimabazinabobakef.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/7139292509.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/64539d1c8c5c6db97771352052b1ffab/40212768697.pdfIn PDF document text
    • http://npas.ru/pic/file/11077338927.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/tololivaruwuxafa.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/rosoxali.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/c0c7da726d0ea01f0cfb54fe9e7237b9/xemun.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/zifinupigifibo.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/50846034166.pdfIn PDF document text
    • http://i-dron.cz/data/file/tijavubelo.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/29933267231.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161351542f3aac---50855683919.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/dejuvotomi.pdfIn PDF document text
    • http://secretinvitation.net/images/files/26815830330.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/92147278087.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/xoduru.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/darepuxinunuruje.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210908055417.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/zivopomedexibarelotusaf.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210904030638.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/vonemetawulogerexobaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=negotiated+curriculum+definitionPDF link annotation
    • 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_off0000dacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACD 10728 bytes
SHA-256: a229cea74e5b72661b894c4a80ea56d55d2572948752ebdcb510f1028fe4337e
font_01_sfnt_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 16796 bytes
SHA-256: 3f3a23e2d8159396876c2a77371e3f85b1e0c547ff8bb1a751c0a7d96a61d902
font_02_sfnt_off00011e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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