Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b473c578cdd5ec8…

MALICIOUS

PDF

73.2 KB Created: 2021-10-08 11:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9f3dbe9d2e0cbb7816cefcdc50d6f064 SHA-1: 85795cbbcb14535dfc603bebe127adb92d2c0c7c SHA-256: 8b473c578cdd5ec85dcb97df7a878fa107681b9f1e6eb656c2604033aa5bea1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/zowagubo.pdf In PDF document text
    • http://www.kickcommerce.com/userfiles/file/62228648347.pdfIn PDF document text
    • http://maytinhnangdong.com/files/uploads/editor/files/89460535962.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/bffd8d67e990cd8e012a2016dba1f82f/67756512780.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/57436997519.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/lakedibezaduliz.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615903f6271cb---13970882639.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/xasarilirivakerenud.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/pekireki.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/vawopenimumo.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109302359480290.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/tabisesuxomawevologoz.pdfIn PDF document text
    • http://juhaszautovill.hu/userfiles/file/segaz.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/vatotukag.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/zisusufokakogafapa.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/fowix.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/63017373486.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/4qm04g2ivgp6c4v69enicgaqi0/welaruna.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/putilekamob.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/35454002577.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021100100294814782.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/gunapunis.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/pewomexup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=gul+panra+new+song+2020+mp3+downloadPDF 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_off0000b3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF8 11184 bytes
SHA-256: 464fa0e060d36bb0404c22fee2e76661faf30082c054f7cb296d1cdda21eef9a
font_02_sfnt_off0000e610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE610 19000 bytes
SHA-256: 7b5cdd8145581f2e28d85bef0b989e4d83636d4fe445257b33beb029d82c46f7