Malicious PDF — malware analysis report

Static analysis result for SHA-256 42014675f917ed09…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 22:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f009faf9b6d50b656be7e4f4c40d7383 SHA-1: 22b9bcc72a8a0883fddb99b7771545af273e4783 SHA-256: 42014675f917ed09643b7a06fbff972b95e3aea7a54846ee439becfa129c8e7f
156 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with several heuristics indicating it functions as a link farm pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI links and a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://pensionpoint.cz/userfiles/files/winezozik.pdf In PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/fenavesubure.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/69124171405.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/49620093671.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/30853010372.pdfIn PDF document text
    • http://itena.si/uporabnik/file/gosujikavululugiketelesub.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/7343061266.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/kagimum.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613618b02a1e8---dibofonus.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161310d00c3d84---51595436023.pdfIn PDF document text
    • http://chongros.com/userData/board/file/7021656276.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613286ec86bc0---85665816384.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cbee0707c---votemunuwuf.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/tevafoterasodabomu.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/wurusebonetuk.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/kosevarofexira.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/jebexu.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/89395932630.pdfIn PDF document text
    • http://myslizdrave.com/soubory/56395211664.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/nitilobada.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/11924263688.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/vodofukonenumamalipik.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/kuwalawowenusijogat.pdfIn PDF document text
    • http://banquat.com/userfiles/files/38448903461.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rapoxawataxaxuton.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210905081617.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353423a5300---27058810118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=interviews+in+qualitative+research+advantages+and+disadvantagesPDF 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_off0000dc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 16672 bytes
SHA-256: ca9c0ebaec5bd78983971f1faa876872ae5fef94ae244e4d940a8c47ca68afee
font_02_sfnt_off00011f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4F 10876 bytes
SHA-256: 9817845ab4ba5ff43c483efa534cfaf39bda154166b7b66bc9afd89082f76fb1

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