Malicious PDF — malware analysis report

Static analysis result for SHA-256 886f48d3074ef768…

MALICIOUS

PDF

69.2 KB Created: 2021-05-08 07:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 228d57ef7cfff64915c5d7115009dd39 SHA-1: 55c3389312a4d78fdef7cc3019915d4e07468de5 SHA-256: 886f48d3074ef7683bbb05100490073befabda5be96cf3086622db367798b3a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting it functions as a downloader or redirector. The document body, though heavily obfuscated, contains text related to meeting invitations, which is a common lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9709

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://m-co.de/wp-content/plugins/super-forms/uploads/php/files/h2aeeeggd54e6g30kq2lj72ufo/rerebuzosi.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073ab96da1c6---revowapubuxed.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/48dd7411faad9d5b36e6813fa821b3bf/70445099998.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f218ccc4c---wisonipumafususaniz.pdf
    • http://montaze.org/democms/userfiles/file/lafeziraritiw.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093da39c3f98---sawuk.pdf
    • http://alpha-cp.com/userfiles/file/fipigirexuxixilaj.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/lkg8n6ca74cfdm2fp9knlcmum5/78924181152.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f3db686a53b9ae2046d6e640394cb2f4/zajikip.pdf
    • http://alexlunacoach.com/img/editor/file/88427270906.pdf
    • http://aarogyamedico.com/userfiles/file/89431214782.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16088ac4253769---jizakesezowifusalaw.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/6036bb4ccd99b921b644b5a262d45dbc/ferunawuzugorapizurelarip.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160827e1eadaf9---xuwamapufu.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082a157cb61b---ripuzuwawamu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=invitation+email+template+for+meeting
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e01b.bin
cd58a32ff41a6c339242b8996c24a6095362bf7d0e28becc493f14175b7f5c1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE01B 5040 bytes
font_01_sfnt_off0000f13c.bin
b4b665f7f94b133f434ab079617829bc5d82bc0fd39fc6ba5ed8318f481eb97b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF13C 10272 bytes

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