Malicious PDF — malware analysis report

Static analysis result for SHA-256 628583e08695b9f3…

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 06:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 44b24450642f708e3481199051d4cba5 SHA-1: 8e609817512758e976af4fe836cc46fff63cd3cf SHA-256: 628583e08695b9f39aa6b5b4986ee271557f4bfe4617128cbfa1e3a10af9c2c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cructi.ru/uplcv?utm_term=haematology+textbook+pdf PDF link annotation
    • https://aljazeerahdrilling.com/userfiles/files/devofexukunevoxokarujob.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/gp4qdv5p1hjs6bijr3ejgoldso/ludekofizinalawojugunotez.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/jojuxorigowanibetidazof.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/82171045435.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/wovejupatofivuxedo.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/devas.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/sakubi.pdfIn PDF document text
    • http://iltorg.ru/upload/file/49270635529.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/4eca60bbcaf6c5c53fb218465dae6edb/nojozis.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/e207cb699b0f0747cf8f01002ea06a0b/jinopapolakofe.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/wupebasubebenepafire.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/waxikupuvuzikululokotab.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fb454d9df---wuniliweb.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e27764b38---69251497214.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/6b42bc6c5c92cbf7e5543921086b4a43/170788370.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/g7bp0ocsgpn7ipslaglck24fhi/3586635973.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/81504849579.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/63595729547.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/ebaa5ef9d44f1bcdb9ab7afd33d7ff90/falidokofumobejexud.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a65064690cc---kizenoboziganizenepogu.pdfIn PDF document text
    • https://cafesca.com/ckfinder/userfiles/files/60674122724.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/43979879743.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_off0000d728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD728 17628 bytes
SHA-256: d2d016283cfb38733ff24baa10fd30a74af0146b25d7da3355d2bdaa06662215
font_01_sfnt_off0001051a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051A 10816 bytes
SHA-256: d4d8f501d4c871eadadd5c9511259d6f5cced6905d3c5337366c8ad9cd232cbf
font_02_sfnt_off00011dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.