Malicious PDF — malware analysis report

Static analysis result for SHA-256 798ad1041721d374…

MALICIOUS

PDF

109.3 KB Created: 2021-06-27 08:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 96a8166ef28f9131c65748d7e1310e7a SHA-1: d44b88a1d822312c3842eb903c56a07977084b5e SHA-256: 798ad1041721d374ae47113e791bf6f08f0f6bb472540d43f2c003de2d65da3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of using PDFs to host a large number of links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://pistant.ru/uplcv?utm_term=solubility+equilibria+chem+worksheet+18+7 PDF link annotation
    • http://dakmet.pl/upload/zesuluvetegitapujuka.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/57t1mien8eeg55olt5ra8lfnbc/borumiwugozusatazatalapil.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78cb5aa60---famakupapibuwob.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/97658116014.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881c7a4f465---fomijidarel.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085a4d0e2959---34879934690.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc24ca9cf2b---42110658573.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077034977f51---giwokikelufoporemogoki.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e50d2a43f---nibofef.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/61570726255.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/03e94e65ad33f1f4804ee877dda2e8c1/34485690332.pdfIn PDF document text
    • http://renovator.cz/files/file/gawafudefixifepolovipij.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/luwijor.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2c906806a0afae019994a6adb915d39a/sawelagerogurezab.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/darunevegarijobo.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/02f08318d2bb966f7bb8cf6286a5a427/xupusewaleditidajelere.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce52281fa9---xozuwamar.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942280026b1---56654181662.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/49220122509.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/418698b0a54256261a1a51686388cc67/17172956188.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a215bf95785119a04179adb0cfdd38d7/votaberafurubukexedusu.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99ce1cc42---5190590598.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_off00014348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B5A 18652 bytes
SHA-256: 6d6bbb08135838929b2dd7a6e79981b0f71810caf96645e932010328858d3094
font_02_sfnt_off00018caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CAA 11452 bytes
SHA-256: 129e6f98a2689f1a8e72580e4865eff667a490929824a1ef5cf923b0cf3fe9d0

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