Malicious PDF — malware analysis report

Static analysis result for SHA-256 a952584cc62121c6…

MALICIOUS

PDF

79.0 KB Created: 2021-07-22 07:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5b723dd22697f522393b2e7383de4bc9 SHA-1: a4a5a92a73451f26dbd13729775aab2be0f52670 SHA-256: a952584cc62121c68c67f3af6f815789d0ec45fca9a03abcd86b4c8f7d1ce6b2
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or trojan delivery mechanism. The heuristics indicate it contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it is used to distribute further malicious content. The document body, though heavily obfuscated, is associated with invoice or payment lures, reinforcing its role as a phishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb2b8258bb---dusifi.pdf In PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/kowobumurire.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/98628957069.pdfIn PDF document text
    • http://sankofalectureseries.com/clients/a/ae/ae3037074ff26ae8502dacd236f4ced8/File/67620112634.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/85894171457.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/51430845243.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c99a6c4662c---57675795459.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/xaramozovizujebufodise.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/db8e206c88f98c2c48f086ca9107b711/4038744224.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/f13fc2c97465b7e5867a89dafbe73c57/pisiga.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865adcc9c21---83087852691.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db2afbcb13a---tuwanek.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/sefidivizafox.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd5a46f0ab---60384814969.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/62374902051.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/mq8frc6hkij86erqmb3did1m7i/72811633690.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098974644388---7994502013.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/jaxafarasiritesel.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6568f7db35---20620899521.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c52000bbe---68786731094.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2f187b85ec49110459fdc2ebbb976fc4/80572965859.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/zepipiwixofixefofebur.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/31926289237.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b29ac890ca---72824053917.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ohbv3r4adh5gm4vi9crkmtj3vd/zudojawonuvawaz.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607449ccc2abe---bulelaxod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=final+payment+release+formPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36F 16492 bytes
SHA-256: d34776ca726b13dc08e2760aa956789470bd1f00ca06bf9bedbaf179e324ed1e
font_01_sfnt_off0000fe30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 10612 bytes
SHA-256: 9447cc3784d342b5cf03058f9e0043fc02b87176bd38a996241b03269a9f1084
font_02_sfnt_off0001166c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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