Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae23f6133f5eb91…

MALICIOUS

PDF

92.8 KB Created: 2021-06-27 12:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: be8c471ad73e59ef7f6ce181e019bc49 SHA-1: 8129befb338fa1ad530d4ae7fa64d157f7b33490 SHA-256: cae23f6133f5eb91fa9a93db88d83cc9e862d4f6042982a8281ff0487caa7279
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely as part of a spearphishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://crysiq.ru/uplcv?utm_term=thoracic+outlet+syndrome+pdf PDF link annotation
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d09a72c96b---85450439240.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1621854471.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/mh5dgv8ka2tldtmtn3acqtiruv/87520262079.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/0a7ecc9f309b24e209c7691aa32c6bed/17789734234.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/31773363770.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a297d5b1971---vukeg.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/59397753548.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b74a36c5476---fufexexasopazifatutakakuj.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/lamusadasewuwifa.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/jblf695inin234emlrrfhjq3b1/vemedajuruvumakisajavumap.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa5cd5fa14---rotibifagujojized.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/pexonekulamebesiz.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/lemiwajowa.pdfIn PDF document text
    • http://tfforming.ru/d/files/rukaguvelunapolidesiwirew.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/wimagaligevuda.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609121fab8542---14426325693.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160708ddf68df5---21832100118.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/26959306105e43e91e2d14cf09990af7/46394947403.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/62395888491.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/xasatizikulinimemoli.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/85872377689.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/32755226344.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812a9a43abf---nuwamuxig.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/52ca21db0ddf51c2b900a09a3317c33a/37698853023.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/5d68gg2td3809bok3ph0kpi9j2/25310560462.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_off0001062a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062A 11064 bytes
SHA-256: 21b698ed001faf695fe16c68a43d162f6dce54be16c1f282b3607dfdb99ea302
font_01_sfnt_off00011fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC0 18000 bytes
SHA-256: a22318851d057c8fd449b9a47455ef97cd8b2cd23cfde8656ec31164d778c837
font_02_sfnt_off00014dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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