Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf11b3a13d0f34a…

MALICIOUS

PDF

72.1 KB Created: 2021-09-27 01:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2c89276109b3dce9277617d096f8de26 SHA-1: a2993466ffbd528c9d0ae6eb07435acd9ebddac8 SHA-256: 8cf11b3a13d0f34a8ebad544739b225d45a979ac4d4cf786b46775dcb6ac5eb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown-reputation URLs strongly suggest this is a malicious document. While no scripts were explicitly extracted, the nature of link farms often involves JavaScript for redirection, and the ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 https://pixomot.ru/uplcv?utm_term=spider+man+game+download+for+android+apk PDF link annotation
    • http://omgmediatank.com/userfiles/files/2294284176.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vewapukusoxumidopis.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/43240531237.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/rojugu.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/wobegugogujobet.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/87000649988.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/97029090982.pdfIn PDF document text
    • http://artio.pl/files/files/daxopijinagezek.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/romitulepakutipiw.pdfIn PDF document text
    • https://tsegypt.com/file/56969680517.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/kumuluwobelifotup.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/dafebavomalafufet.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210910000624.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/2010575045.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/79383664848.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161461efad5a20---basageduvekomeziruderuka.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/1781814397.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210920174550_26778247.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/dokevasirixetedosu.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/3265365421.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f59903f0d---30099478327.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/benineborazudodurinuzuna.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/47344169585.pdfIn PDF document text
    • http://belst.by/upload/file/rebaxoxipududunoxagobu.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/7445067530.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1615048517e250---zilawefonebesareteniludan.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/vorolesuje.pdfIn PDF document text
    • 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_off0000b6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B4 16856 bytes
SHA-256: 9ce44ab59fb848853bb097a80ecf5316f504f1b5090039fb9ca1d84590d7e252
font_01_sfnt_off0000e1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E6 10828 bytes
SHA-256: c6392dbd40699e564033a0249d474d6766bce6305c2bd925c401851aa541c474