Malicious PDF — malware analysis report

Static analysis result for SHA-256 11573b8ba8be28f3…

MALICIOUS

PDF

96.1 KB Created: 2021-06-28 21:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 015e9bb376019ac16c4e03edad6dd093 SHA-1: 84e27d6c8d5fb6fa96a44b5420b6b0c1440913ca SHA-256: 11573b8ba8be28f3b46927572dd8b09ba5d70732d062bf538fbceead876f6ad5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple URLs, many of which host other PDF files, suggesting a distribution mechanism for malicious content. Heuristics indicate these links are on compromised CMS uploads and disposable hosting, increasing suspicion. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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 http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607901ad98f18---gonerigudosutobip.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606e38d84e19f---lejomi.pdf
    • https://hospvetcentral.pt/site/upload/file/43454409394.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b3228d4dd5a---80870860321.pdf
    • http://hbleg.com/admin/userfiles/files/96305915347.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd73156a25---neragukokujewewam.pdf
    • http://sdds.be/userfiles/file/zekedapenusokebowagi.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/jld7ggjqlp6ai6bm7ghft2q2ig/ginefavegibep.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39bc58c392---vabudasukinudi.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/cttev3qets86asiiccmv1s7lkg/zogudelagopotenoz.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/2df126a4338a55d28591d2726b1807c8/ratopoferite.pdf
    • https://littlelightnepal.org/userfiles/file/wiwapimad.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/1nt0s5534q31201f1ac7f4d6mq/68256498395.pdf
    • https://aedwea.com/upload/foto/76909131122.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/91895529140.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/lavuwejeridav.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608200070b5c6---saviterupobotusalu.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/8faea1b5cb4ee881bb4cea2a372f1a94/doradopebegomedikufon.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798a75df887---6619634365.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160beb98553a66---71493331899.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a80821d1b6f---jogenuredifonageg.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc62b151f9---18933890719.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1eb269647c---zajenabisolozupo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+does+ma+mean+in+spanish
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB34 16792 bytes
font_01_sfnt_off00011345.bin
d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11345 16488 bytes
font_02_sfnt_off00012a32.bin
cf0a32d0608fffb1555f5e8d268343b63b83ba2e49f998cf1dc1df47ea812423		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A32 10504 bytes
font_03_sfnt_off000141e5.bin
486097a233684f175ac193b14d551efd089fbd7eda16997def536a2e19820a35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141E5 18888 bytes

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