Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4935da0f0c4587d…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 23:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef6d7acabc095d644083bbbc29faac59 SHA-1: 1e8edc30408898e0f7a13365d30a58c2e1b3019f SHA-256: d4935da0f0c4587d46c3ac5081189939f684ed4c63edc771d0466d8dac77b0e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://rapet.hu/files/34488046162.pdf In PDF document text
    • http://apothepharma.com/upload/files/tilisizelivunutusakop.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/25dab7c7edd1cc3b211059beca3c2482/niwegituxadof.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/lonajulatuferifi.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/nudoxomure.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613854dc68661---botiturozesajewifud.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/87119115780.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/miwikejekazijovebupozo.pdfIn PDF document text
    • http://crc.creativechange.net/ckfinder/userfiles/files/zorugivizabebuxatuta.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/72424631533.pdfIn PDF document text
    • http://teplospectr.ru/images/files/masekavanaluretol.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614471a284327---65724574885.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/luwox.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/vesakixogetebejosun.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/tatazomegemipuvemonator.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/xabaniv.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/76361048498.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/pevavatizokoluwom.pdfIn PDF document text
    • https://electroagro.es/pub/files/24559050883.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/nitara.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/6208277273.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/8909361592.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/4222381524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+transfer+call+history+from+android+to+iphonePDF 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_off0000d98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98C 11076 bytes
SHA-256: b7a4dbccd339bd00fe8792fa9795f8645091db0156c9ab5216bc0006b4ed9811
font_01_sfnt_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B47 17712 bytes
SHA-256: a1dca51ae359009cf230b400b7bf166b8e41d5c77947dd824290c798e26a197f