Malicious PDF — malware analysis report

Static analysis result for SHA-256 f183d35413e661de…

MALICIOUS

PDF

239.8 KB Created: 2021-09-07 06:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 65771d4c6089fbf556ef62c8b1cf199a SHA-1: b2610816d21645697f960fbbf53a64ca0730f1ea SHA-256: f183d35413e661defaabaead1831e98f60c99b7209a28a7519d0afd8f3ba7352
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, indicating an attempt to deliver a malicious payload. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9823

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a58685a17---kifereniribasidumutig.pdf In PDF document text
    • http://zlato-invest.cz/upload/files/wozukuzukipotabelil.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898029199d7---409869234.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/nefurozijeduzitaliniz.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/235913be7b5a391ae3066fc4a0da8ebe/90563973689.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bffcb36c56e---29602103261.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/55047895837.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160901f34a1a93---pelojifofokux.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/33751021204.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/nudafu.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160978374cd145---jebabuxepupavud.pdfIn PDF document text
    • http://dezis.ru/uploads/files/jiwujugimenun.pdfIn PDF document text
    • https://makenie.com/upload/files/14448712513.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/metizawevegi.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/1254437045.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/16340670361.pdfIn PDF document text
    • https://people11people.gr/uploads/File/89680157614.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/dogemufijelokaxawokikiza.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/58426089767.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/modegamagigiwupeku.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609d147fb62d6---84283929366.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a4558da5a---morosukuva.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160da3d700bb08---18331146213.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/91379040405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=promax+seismic+processing+software+manualPDF 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_off0003489e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3489E 20396 bytes
SHA-256: 14c795cda92b01adc33ea343063aac0d53497badf96611e318a400b2e337f7f8
font_01_sfnt_off00037e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37E6A 11112 bytes
SHA-256: 02de1ea2c923e9c2ec9d35a74df2000df6b633355ba3748f81618ebec8f0d641
font_02_sfnt_off00039874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x39874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1