Malicious PDF — malware analysis report

Static analysis result for SHA-256 161065e237d3b02b…

MALICIOUS

PDF

84.4 KB Created: 2021-09-20 04:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 46501feec6d58890b30d2397d6e0a944 SHA-1: aad57b5e703eee3122f12333ee4dbef6ec2f27ee SHA-256: 161065e237d3b02bacdef2a99f54cdef90c0abbd99aa582b5bc038009ad1dfaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on different hosts, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The presence of 'utm_term' parameters in some URLs further supports the idea of tracking or directing traffic for specific campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://crysiq.ru/uplcv?utm_term=best+games+for+android+under+200mb PDF link annotation
    • http://interel-rus.ru/test/sites/default/files/file/95784970396.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/negekesedeluburekonuzef.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/58824407652.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/musoguxepamo.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/3f2b01c2cb631c6abdcd7f8d458e86ea/3052361570.pdfIn PDF document text
    • https://kaparatt.com/images/File/nigetux.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/31400914648.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/lofov.pdfIn PDF document text
    • https://cartolmania.it/file/fojak.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/lijox.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/vetuduvejag.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/13921212883.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210919032312.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/kaladiximu.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/wepetoderikobofivowij.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/17732343404.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/88079494220.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/womitorabal.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/nupipedusiwomizup.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd7d45ccac---zusere.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/tuwelolo.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/xufonupato.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/c41a01e1a36935925379dde34a6c7bbf/46279426921.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/46675565052.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_off0000e4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0E 17472 bytes
SHA-256: 399aecd2c691a58c10e67f095c8e5966195225e4c2ffd44b13af299d584b7f4c
font_02_sfnt_off00012a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A40 11184 bytes
SHA-256: 4c004a3b0ba54718e2d98cf7201e2bc2355150275da815c722e94a76d75a30e1

Open this report in the interactive analyzer, or submit your own file for analysis.