Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aae03c2fb77e213…

MALICIOUS

PDF

78.6 KB Created: 2021-09-22 14:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d035c3cbe77d252d16fb09f69fdfd0a2 SHA-1: b2278be5c9f97e39b2f4e2df38c213fd1e9f79a5 SHA-256: 8aae03c2fb77e2135285ca50fd195b68a567e9e46046bfcc6d4b4ce251d124b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other potentially malicious sites. The document body is unreadable binary data, but the presence of numerous links to external resources strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1dfb26210---lomixoribezodonute.pdf In PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614447ca75b70---27294472424.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/9715117407.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/s6qs6fggtmkp3j9hccms409abk/42164327140.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16140c54bd793e---42374016061.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613444276a243---88041460114.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/sibeledovozijovekuwuwir.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/74053086551.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/fibugelojagulo.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/83725483346.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/rekesetotirifaruxorujovef.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/dibobojatasofo.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/43650167992.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/46137597161.pdfIn PDF document text
    • https://dukupahit.com/contents/files/30305918831.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/40316933666.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/37934102221.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/rugume.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b6df177f7---nududefunizukile.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/javapewudemup.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/torat.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/62656689494.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92804852797.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/pisiwibofawonaxubufajez.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/32263230234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=10+best+android+tablet+appsPDF 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_off0000d122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD122 10604 bytes
SHA-256: 34b5fd809d01d2a4b846aa90d2b249dcf3d7407315df94ed3762c49f309b0c36
font_01_sfnt_off0000e93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93B 16800 bytes
SHA-256: 01b154e00b34ecf7f6d2fa170f7f11587c73f3fdbece6962da34010587097ab9
font_02_sfnt_off000114ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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