Malicious PDF — malware analysis report

Static analysis result for SHA-256 775542c5b3b43bf0…

MALICIOUS

PDF

99.7 KB Created: 2021-06-27 15:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a96e459d9f80fec537de3954ad9ed2d1 SHA-1: 8b124c1f6478a3c34eff691a8fee1db79fc5b979 SHA-256: 775542c5b3b43bf01c826d0e5289506e6430221f1c180fa900a7d1cf939e2774
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://led7.ru/file/95474850009.pdf In PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/169fb8fd767dc131ef3424289a6ae4b2/4237426472.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aeef5eda9---28219358131.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6b2e92854---8622172167.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/gegajivezusilotenofij.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/gusiwibotejifisug.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d468edebd02---5828285123.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/4df69c1c3971cc992f02652b52a9cfe1/jujowuzasobenumoxesomane.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dedabe607---91728198085.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/41268373033.pdfIn PDF document text
    • https://proia.bg/userfiles/file/82353572957.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607218e9d4277---67140073811.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/xedusidofigupi.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a036f63db65---97993909944.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/6985p7t22mffd11ek0r03kr53i/tigonov.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/11668028659.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/03e65db27c0737b475275945e2ee8b9b/jaxovunesotanewexo.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/1sa9figar86e66slt32coi9al6/84474787592.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b174b763b20---pakowuzutog.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f486f53507---davux.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095cf32afbbf---90142064131.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/kaganilefitovo.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/53369731017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=line+balancing+problems+and+solutionsPDF 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_off00012082.bin
8fff092be839ba96b0e3a0c8bb58b650581b172a825b36955213189803cc7520		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12082 11052 bytes
font_01_sfnt_off000139d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139D5 16792 bytes
font_02_sfnt_off000151e7.bin
23678b684833b3194f2b31dd2d59a65fa721f1cca61fee5e7705199aa72117b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151E7 18668 bytes

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