Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b1136dcfb6f94e…

MALICIOUS

PDF

88.5 KB Created: 2021-08-14 08:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1c33c80a9fc215501cc80075a83e9789 SHA-1: 7cb03cf1dbe3e9e1ba5f40ca3b062c0f3c3071b1 SHA-256: b3b1136dcfb6f94e1afbf63feb3208f9fb74fd770998d64a7f4a462bf01d1154
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://infrive.ru/uplcv?utm_term=baixar+dls+2020+apkpure PDF link annotation
    • http://polletnv.be/uploads/files/89481212421.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/99834567144.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606da6c54e0b4---tekoto.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/28055145625.pdfIn PDF document text
    • https://bselink.com/userfiles/file/80349928809.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610321c56e907---damima.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/29170564da1bff4932448c94bc586d71/garukubigamale.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/81033650638.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b985c1108b---79388737736.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/7a8f0158441b6b44d2a13f9d635f6072/97857233689.pdfIn PDF document text
    • http://paliukenas.lt/i/File/xorenamu.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/wedimabuvuxino.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/44327595648.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/sixipijafa.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/reladekejolebupidonobemo.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711d7b7383e---29481118209.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b17fa4f743---93444774159.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/59320416925.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/wutoxabivusibejixofe.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8038cdf94b---terosowedeb.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160933fc788c0e---fukepapizumegu.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/92848081872.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/zetukojo.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_off0000f487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C99 18404 bytes
SHA-256: d05c5f6140be92c318162616bf981609da7c5e39458676d3c9a2cdf8f83d5762
font_02_sfnt_off000139ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139ED 10652 bytes
SHA-256: f71267bd8553dc13ba03aec92b796bd38e2a4358092f62d5be399db2e91e3bd5

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