Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51c436e7832248a…

MALICIOUS

PDF

74.8 KB Created: 2021-09-20 12:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fa2cdd6779f0fbdce35741ca474875f1 SHA-1: 34028cfc004d90e6bb03a56da77f8d2c5af452f0 SHA-256: a51c436e7832248ae397e50057d11c70b9f47e08aceff92f30dc0fe5bbc59873
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM rule further support the conclusion that this document is designed to manipulate search engine results or redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://riversedgefm.com/files/file/kozisozesijakosakejurufu.pdf In PDF document text
    • http://omgmediatank.com/userfiles/files/vusobar.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/wigekikorajarozajixabel.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613662935cb14---bawuxafedigegajebixifoz.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-4/20210904163019694853.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/togazab.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/70038444231.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kikirozimixavexositifo.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/widubagemixuligijirib.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/48116382702.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/98361164179.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/nuxabilorunef.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/f09bba51ee27dfb1fabab5b563d3b9ae/pisus.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/96829466763.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a153e107ff---38827937388.pdfIn PDF document text
    • https://marosme.ro/hirek/file/pogofibezomasanevexa.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/zapavinexunomaximifo.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/978096408.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/gadizoxazivimudojo.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/pakorirawokoxefuv.pdfIn PDF document text
    • http://tabletopad.com/images/file/vexidotag.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/14294683820.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/maruwowefasuwir.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/retisuxizavemolixo.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/45426209065.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/vobavigumalidiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=one+piece+season+1+english+dubPDF 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_off0000bf56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76D 10912 bytes
SHA-256: 81d6348e9ea818f3eb58da86464fda56e0b97f19dd9463d8197b859f3e4e3922
font_02_sfnt_off0000f035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF035 17340 bytes
SHA-256: ca026eaef1047986b5d07b5e836466917103f4f85a89062df5fba73403b60792

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