Malicious PDF — malware analysis report

Static analysis result for SHA-256 40da98a88fbb28a1…

MALICIOUS

PDF

71.8 KB Created: 2021-09-07 03:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d4069a10c21f597a1f2c4cc48e15334f SHA-1: c0261c16c6d2215157e8ce4117ae67bcf73622a0 SHA-256: 40da98a88fbb28a124ce26a299716530399127844973bf59b4c4b4a1a13ab0c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/b215bef72d4aac338ea029f4ebbb9e05/pijugolu.pdf In PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2acf1aa130---xeweji.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/wubafovosovasilo.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819c6df0377---18695741188.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075caee709c8---37172779355.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/045c8b5d3491e5623af8841551bf7318/68591646935.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/genenikivuliwami.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc18e4b533f---54250993746.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/trejdjg8ll27k9avrr292lh46g/83792004703.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/4df869fb79a894536aa478ea2f5ace2d/negamuwibipimitinusatipa.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/lubebe.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/95555265515.pdfIn PDF document text
    • https://egca.fr/userfiles/file/78024311013.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/aaiqib7siajsfm7fthtlio7i46/11180223775.pdfIn PDF document text
    • http://fittbikese.hu/files/file/18212712003.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607191dd3fb03---40546930915.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/rewijerowidinefilo.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/30428130728.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/67676299312.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1181abea52---kebidujelojasigodenakis.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/bexafusisoxibimibo.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/4929914683.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b2c5467c5---52960846561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=doss+traveler+waterproof+bluetooth+speaker+manualPDF 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_off0000b765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7C 11016 bytes
SHA-256: 350f9c844c4d25d85e6fc9f588051b25b979f8d34c28c2ad90f5875fc986d043
font_02_sfnt_off0000e8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C6 16244 bytes
SHA-256: d5a56fb6b053dcd1f288193e4c4adffa76cee38a2342e4d60d386f24f2ce17b7

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