Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6600d68812feb13…

MALICIOUS

PDF

85.5 KB Created: 2021-09-04 03:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3b30a8755325c37bb10f120dbc2db120 SHA-1: e70dcb20a244f2fadd92cf1483898c61c5e4432d SHA-256: f6600d68812feb1324019684dbde112d4924de04383be6dc92516a99d1d29767
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and a link farm structure strongly suggests the PDF is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://krisoc.ru/uplcv?utm_term=the+startup+owner%27s+manual+ebook PDF link annotation
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16091043546.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/83449900979.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/dakewiwamikopezapij.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/17c7b7eacdb12a7bf19fb5cf6bdc0e22/78324152023.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819ee54e2ad---nunedosozimizanifirub.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/malewugokifilumelig.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/xeguvaxujevezok.pdfIn PDF document text
    • https://renault-service.com/userfiles/78944688528.pdfIn PDF document text
    • http://alvitraders.com/files/64101392905.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/kagawuvelenef.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/55246254978.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c9f855548d810a638caf17a85db6dbdb/58253139124.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/safup.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcf3d135e6---20604238983.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/lewoja.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202107192231399126.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/xirinofejaxaj.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16094aba8cceaf---sekegodofujewaromujavu.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087b76f530ce---godilakud.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/fariwujepimidirareduf.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/81090059214.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/detatepuramotipefa.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/87685310644.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_off0000e93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93B 10840 bytes
SHA-256: 03bb60c53a1854b4c9cd35cd8b7a2eb0cc261a93d104b40efde77b6e23835cd0
font_01_sfnt_off000101f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F3 17996 bytes
SHA-256: 33c75ab3f922f858b1b29b276acf1f5967ba5d54f65873d51526f3d262849482
font_02_sfnt_off0001304a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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