Malicious PDF — malware analysis report

Static analysis result for SHA-256 81978307ef4f97d7…

MALICIOUS

PDF

109.7 KB Created: 2021-07-24 05:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3d5a7c120ebe1fa86849aa376bdea5cb SHA-1: eae3df1098801bf62b365b68812de6e880d8ecc4 SHA-256: 81978307ef4f97d76daf5aff40c36d684e58cf33b4c94a7072a386756dedd1a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to leverage compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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 http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6981891bad---72487928998.pdf In PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/a8d74fcee3e0b63871aedfa759f03818/fazamu.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/00753328cc34769f215223155a21bbd4/12099396450.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/turenifofojagebusu.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1424d17ea---dajogefasolem.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/nenulunuw.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/816253dc1ab9ff4ab2100874bc82500e/gufeka.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/gegiwagominoxijanaruk.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/59783701708.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/vufimarijawi.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/semonotujaru.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/11056747565.pdfIn PDF document text
    • https://medtek.vn/storage/file/98409511149.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160830a432e59d---88377197935.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/bki31dvd9cuh675bmosoresvsp/gojutezawoz.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6e05c5e14---80025542454.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/tepulukowujowudugule.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16259090221233.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/rijokolu.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/94915195277.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/07e161f77317352fa8876ba88cc5c22c/46025629465.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/5be35bb25e3f4a5f623549e155380e49/konuvovanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=sister+catherine+cesnik+autopsy+reportPDF 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_off0001333b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B52 10804 bytes
SHA-256: 21a69e02d121645c113e275e7e5c3da369a4ff503dc6cf90e796b569cc9922ec
font_02_sfnt_off0001642d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1642D 2252 bytes
SHA-256: f6a9165ff81fcac992ebfa574775dc691d9a294a62bbcabde252cb460826c8af
font_03_sfnt_off00016e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E26 21836 bytes
SHA-256: 987331687e1c2eae684a8d507bbfba5b8704a998ab7b7c5ea02bb629fa22e57a

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