Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d4592f757fa5f6…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 06:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3fb071086ce7d3c760a5a2a2d1e978fa SHA-1: 76d9c86b424ffd130b61ce33ed87acd43dd4a8d3 SHA-256: d1d4592f757fa5f6bdf29b579d45139f01b941e6a47f20e2f519767c155a60c4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest it's designed to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://coretry.ru/uplcv?utm_term=appium+sample+scripts+for+android PDF link annotation
    • https://monographie.com/ckfinder/userfiles/files/depudovibem.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/86361091296.pdfIn PDF document text
    • http://envigest.cz/upload/file/54168215670.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/bamakofebozaxora.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/95910260261.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/23718804322.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/53480617289.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/58495241621.pdfPDF link annotation
    • https://ww150004.linebot.net/upfile/files/20210907151140.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/91362264324.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/39312783961.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/12002095645.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/32315992413.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/11027198944.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5961ce625---jutesegama.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/32361ab49d4f94ba9c92065b67da90a1/32792150987.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/bepol.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/bagipewilixefozadakak.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/f63sd19ik56l6lq9rgv4akas25/16074243338.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/mexowidezipovojabunonej.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/24756830406.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/kutamunuregerabova.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30161168409.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_off0000d276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 19612 bytes
SHA-256: 9a9c715e4e270a35b4d4cbdd0d5012da1bfc5e209de6e86dbb278a887e56d608
font_02_sfnt_off00011dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAB 10864 bytes
SHA-256: 8f56945591d23a0054fb76fe9df0d5eafa3f662d66e498539bcd82e9fda526d6

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