Malicious PDF — malware analysis report

Static analysis result for SHA-256 c134379965416900…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 00:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6f2cdf670892a0ccb0f8c95eb8fc87af SHA-1: 817fd89e9997dae4f2648965f5d30c300c0a2767 SHA-256: c134379965416900268d8133c8b7b16bf7e590a6ea2c806e7a87eb1247c10c9c
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cdn.eagle.mn/uploads/userfiles/files/43830572314.pdf In PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/roxamasamaxixedefuduvug.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/murulaniki.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/4c772c15554550706e175a1990e379f2/43191950968.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/72784257876.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/46664890573.pdfIn PDF document text
    • http://epicridesnepal.com/files/rabovaxodoravodijodufapir.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/xajutopetubufugetupikuge.pdfIn PDF document text
    • https://vontobel.shopbyeberli.ch/userfiles/files/20892025850.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c242258b7feaa2c47e692551d923d442/kogilewebizoniruzogez.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1626742538.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/wulojezosixuvi.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607359d6ebced---bepivatugi.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e74ca7b2fe---28478416053.pdfIn PDF document text
    • https://congchung7.com/upload/file/26576370464.pdfIn PDF document text
    • https://10s317.com/uploads/files/202108271655328910.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/92193208606.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/jejesilobezevolepisepo.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/rewerukedikevibifama.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/fizam.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/zexubuxijupifonowirudufez.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/20384206564.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/1262655304.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd18b6fdf8---32576759568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=dictionary+german+to+english+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_off0000da18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA18 11184 bytes
SHA-256: 8b45a1e62786420b83418af4a41112bf3675b747360f0a2b27a9029218d2d112
font_01_sfnt_off0000f3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF8 18460 bytes
SHA-256: 728fd9130aa604dd6d1605e06945d6489ae8903b43a012828f7cc5471767a410

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