Malicious PDF — malware analysis report

Static analysis result for SHA-256 3610b403783b7d5e…

MALICIOUS

PDF

71.3 KB Created: 2021-09-02 01:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 50addc168a1f93bb1f4b24a4b6cf7d33 SHA-1: dbdbb4fbb73ea5d02f3c0b9312e0ee6f210fdc34 SHA-256: 3610b403783b7d5ec802ffefb0d920cad8f97f1e833d5f3d01ac616678df9ac4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, but the structure suggests a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://pogservice.ru/userfiles/file/bazatelupasala.pdf In PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/pirarujebi.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e27b6ff2dfa---44964073750.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/528phso2rsq7cl82seu6c7td0a/94240601858.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/3b501e3ecc1d02d07d3ce719fc3aaa05/96906424557.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/monivofuzejukasi.pdfIn PDF document text
    • https://dpmceramiche.it/file/47712112500.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b03aeb4d1d---34866431247.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbebfdd9846---fivovidivoletipuxo.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/79737613308.pdfIn PDF document text
    • http://fittbike.hu/files/file/39247000159.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af4226ee0ad---renijul.pdfIn PDF document text
    • http://decorstore.eu/upload/file/luwaxuw.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/71878407133.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/rodamefofadoxotomefube.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/uksm23q6o5dg1u7jdft4hk3fae/84933096920.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/39651108695.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/28952324691.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/babatigarosi.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610a66311d7de---kekog.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/80b4051d927efd8f4361c732ca2a4462/jaxivaguxorinar.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/1400225924.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2273a2296f---46331730888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=red+moon+2019PDF 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_off0000ba15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA15 15260 bytes
SHA-256: caa8ae24169feaf8b54e7f83484cc9d1c5a34fb3e184fa1c37b989cdd2b5a630
font_01_sfnt_off0000e086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89D 10252 bytes
SHA-256: 344b3c660fe4b14931e7673e6f3759e9bb87b15c9cbb007f5ffdaa5023af9342

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