Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9d3a8b2fe77bfd…

MALICIOUS

PDF

70.7 KB Created: 2021-09-18 15:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 34b6c15aed4bd781d4cf28da13d29f71 SHA-1: 9ef804016f05c16d0edf6c03521e041ddcbe3093 SHA-256: 0f9d3a8b2fe77bfd07d4e7c6fe76c78f6d074fe28dec21500c457ff0893d4b16
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The document also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to obscure the true destination or host malicious files. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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 https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c93a0ba8d---240573323.pdf In PDF document text
    • http://yokohama-model.com/userfiles/files/rejidi.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210903043227.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-16/20210916051938298819.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210914084955.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/sorojoxemasezojor.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/fikivenuzepuganawod.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/jetodotadidifafatu.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/12588154760.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613515ed113c1---67592458087.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161456a0328506---89939343718.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/10665393741.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/77085873792.pdfIn PDF document text
    • https://artbynela.com/uploads/file/jorafekubivadorefo.pdfIn PDF document text
    • http://chpcentre.com/files/file/71232706011.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/fowipipujaxemoguw.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/jijumexagavax.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/sujidebisomubarazuf.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/bosaxevusagukinazut.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/xugukegomedejizaduv.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/91461188883.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/tunanetazuwaxid.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/disaresoratibak.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/87095148791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=mi+8+pixel+experiencePDF 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_off0000b3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE7 10124 bytes
SHA-256: 4b9ccef8d2918dfdb8e052b16b4a45f466882c9c0215f5bb6631edd592149d80
font_02_sfnt_off0000e28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28D 16936 bytes
SHA-256: ad99975c687524c5dd9c59954f7ccfd81b35c020758686325d5bddfe9fe84b10