Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f922471d17e5691…

MALICIOUS

PDF

78.7 KB Created: 2021-08-11 04:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a69b87b02a433dffc8406d4ec00fd5b9 SHA-1: 575a40970ee9af1e69b7c7413cec859a4196537c SHA-256: 9f922471d17e569110230aaa6e7288bcaeda783be1ac8c52c07c9f7bdc8cfd8f
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to lure users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kodcomputers.ro/2664/uploads/70928739681.pdf In PDF document text
    • https://samavetpharm.com/userfiles/files/90430596905.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/vaxifeju.pdfIn PDF document text
    • http://usmleworkout.com/files/file/83538950913.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082ece4ea9e6---rezofosumoxeminofujo.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/86150762602.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/supufiv.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///gozivagoxuvejetixigoforot.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16074a79b66866---leraboxodediborigakozob.pdfIn PDF document text
    • http://jcaf.or.kr/ckfinder/userfiles/files/gofano.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/66893786417.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/gesodasuvudovapinokujowup.pdfIn PDF document text
    • https://vestol.bg/files/file/44032557899.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/wibefebifixum.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/zewaraz.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/31386798497.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/uq5q7q8j5q8d7gopif7u3j21n5/6433764050.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3781cefafd---waxibe.pdfIn PDF document text
    • https://people11people.com/uploads/File/48993822877.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/lekagebalomewabulipajik.pdfIn PDF document text
    • http://technocom.pl/editor/file/jejazux.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/da867a43a6c93b02fabc1708a1156a76/64980618313.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/kotivujasukavikejumolotax.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jafafelozebejorupomugera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ejercicios+sintagma+nominal+3+eso+pdfPDF 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_off0000cfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA8 11248 bytes
SHA-256: 065a5fffbe010ce798c5d090763c9a27c61ed60a8b7dec1641393ddb350f03d4
font_01_sfnt_off0000e9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C9 16688 bytes
SHA-256: e34cfb41f664b3390d8a2e2df86b464cb7a286a0e32b31cdb01c09b9ef0f84ce
font_02_sfnt_off0001134e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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