Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d428e8f25584db…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 16:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d4d2ee45abae8ee577287af0a066b0a1 SHA-1: 10d3c04deccf701e19137c0450bfbddebb9371ac SHA-256: f8d428e8f25584dbccd8402b1f358e6027b1f6ce2273d4cb38f6f89a7d50a55b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting it is part of a phishing or malware distribution campaign. The embedded JavaScript is likely used to facilitate the download or execution of a malicious payload. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613c38e70c028---wivuwidikogifesovagiser.pdf In PDF document text
    • https://rosenstein.lu/userfiles/files/reruxudumazolelenajovu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7d9c7b842---2867188026.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec256041d---kexarigiviloxupenaju.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/52257273594.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/60940102687.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/tegozirovo.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/luwiwezowopezu.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/kerirusipitipeke.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b537283fa---96341267005.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/funepul.pdfIn PDF document text
    • https://braus.uz/images/shared/file/96853792199.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140eaa46f61e---jesapofu.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/jiresipapuxazonabemig.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/zuparikokokobeni.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/89831802845.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/47598102676.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/kifenitiz.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/21750622217.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/lunasawi.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/57539996923.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/87895667823.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398bda7a92c---80645840208.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/58686892984.pdfIn PDF document text
    • https://agros.net/uploads/file/62663246936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=cs8082+machine+learning+techniques+mcqPDF 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_off0000d248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD248 11284 bytes
SHA-256: 46f79050b9e97f6db2cbf3fda4cbae244547b01c2327fecd4f6c918c96727550
font_01_sfnt_off0000ec5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5C 17520 bytes
SHA-256: 6ddbabbf9dbff113e7cc8853e968f2d284eaef6ecda7c68fd57d4db843fe7fe6
font_02_sfnt_off0001195c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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