Malicious PDF — malware analysis report

Static analysis result for SHA-256 a666a9f9a7cd6469…

MALICIOUS

PDF

86.8 KB Created: 2021-07-08 06:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d3c91dc79caad48953e0c48acc727b6f SHA-1: 20bf3c7f0ebe5a6f22fb96f65fc8119d77502419 SHA-256: a666a9f9a7cd6469a074e891319fa4d62634a5643f4ddbaf7f2f7c8f4728b7cd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure suggests it's designed to act as a link farm, potentially for SEO manipulation or to serve as a landing page for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/be0c5c84d06fa85faabf96c9ebca315f/vusapuxinefogureleletege.pdf In PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/b67f9956685eebc3103cf92c3fa5155f/lalila.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6546dc7e5c---15168198839.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/a9bbb33b34831ad507673e8576bdce3b/pabeduzubamemakudajufalib.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999d22825ec---suxuvowiz.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/55579823585.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/gonowutema.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/155656546260d9c38909c5e.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/98466397269.pdfIn PDF document text
    • http://zerosquareonline.com/file/revoripibemozipojira.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/2a400ab42e7f92cca8b09ba072e2a95b/1223398830.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756afb6cfed---wepofubikewa.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/42425057212.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/82a32749284c28ac25e70774d4dfa47a/kojatarolikevo.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/fj040id4na46n431dug03ajje0/zopafinaxirezusoregolij.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/73513256902.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/47148741249.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/19242297234.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a007fa03d78---rifazudubet.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/597c2f5271d1cf28148e02ab27d6f572/wanepipebikajuk.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/riiptjm3dnnqd6r5o39bfa7l2d/pefederolirukuwedub.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/vezikizivujajika.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/sagowakug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=what+does+sum+mean+in+a+math+problemPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7B 10892 bytes
SHA-256: b49eaa53e846466b7ade8008597980f4d14d5e30df9d56d0ce15efbcaf878810
font_01_sfnt_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
font_02_sfnt_off0001085e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12070 17144 bytes
SHA-256: 1c4fae0ea24f2c4005a65d287825fe8adb0527323a46391780ab4ac380a14f3d

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