Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41281318fd1fcd9…

MALICIOUS

PDF

78.4 KB Created: 2021-09-04 22:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d5ae1272dfc52070a35f5e9807bfeeb8 SHA-1: 8656ad3aa25a3e1986dd3e389ae867002d31efeb SHA-256: e41281318fd1fcd99608948eeeb5fa203d7db1adee5d15b59787bfa289d7d9ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://deeringbayrealestate.com/userfiles/files/54018135510.pdf In PDF document text
    • https://resonanceacteurs.nl/userfiles/file/rogolowaxepoza.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/31033875096.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/44875953103.pdfIn PDF document text
    • http://praguetransfer.com/files/file/kuzadukuje.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/wodijawigafofovetomep.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/wixapezor.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/43854667591.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/20145712809.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/62768906035.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/30652477537.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/vemukodafomi.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b19ccd238---18160647329.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/dugemuzegoludupedefapebex.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078ce575db0b---mosajukumepuza.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/52917533611.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608456c7c8a0f---10741231713.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/95371247719.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ab6f2101c---vutagajupobige.pdfIn PDF document text
    • http://effektfilm.de/files/file/60405150711.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723131eb3a8---9671338947.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/52e21e9264da7c08952098542f3cba97/40383024945.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/dazumozakoxuvarisu.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612b2b6adf3e3---vupelabineseru.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/us8qu5kh65brsn3m4o6mbokdcg/31516664426.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cc8143a9f---46479752275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=donna+haraway+when+species+meet+pdfPDF 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_off0000cb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB71 11040 bytes
SHA-256: 5fc2beeb9b2234ca9faf8b124173d98b2443681498b027b87b5c86e6c75a8164
font_01_sfnt_off0000e50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 17772 bytes
SHA-256: f1eca832bf218e81c83d83c572f9939c87e39b399f89ff5eb4a06d3e5f74de34

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