Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ce06113c19d597…

MALICIOUS

PDF

83.5 KB Created: 2021-09-02 09:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a3f8fe274ff88d7dec3746e2d6ee87b SHA-1: 2b8575a18326711a4f7947d94aec4632712fae21 SHA-256: 53ce06113c19d5970e8d6cb4613b10f00b7aaf4776183e8fa9a4aa89dcf259b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous PDF files hosted on compromised websites, suggesting an attempt to manipulate search engine results or distribute further malicious content. The presence of these links on potentially compromised CMS upload directories indicates a distribution mechanism for malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://clinicaveterinariaalbese.eu/userfiles/files/10278720191.pdf In PDF document text
    • https://faresaldabbous.com/uploads/files/kunitajepamemujinas.pdfIn PDF document text
    • https://dintek.eu/uploads/file/43756308310.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c70cb92c75---39057464153.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/24822097077.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/mojuburadojixa.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/95527007934.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/21161967137.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/5d7072ede5ccae39a06d6edfebaaf069/25449278632.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f773cc9595---bubegurevi.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af6c6334d0e---vavuvogevopuvunum.pdfIn PDF document text
    • http://zimmerei-possert.at/66045021681.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609748e1ccd05---gugurub.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2a52872edd41c4cc74485e15020a788a/taximoxogegilalenura.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611275ec79fa8---49635433837.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/nisibikuverurirowukevu.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6da2397ccf---75491224932.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/k0h71pup2quv23156e63fgbenl/runidigonakevajodofo.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210629055907985.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/23840728510.pdfIn PDF document text
    • http://pbpharm.com/upload/files/14595896399.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0b84ee170d82d49259e45d9a213f8d40/72721090768.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1611a46458bf59---15118788226.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/34e2887c1a5f1d73dc0398ae92e933e3/fesanamazolamur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=photo+collage+software+for+windowsPDF 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_off0000e300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE300 10844 bytes
SHA-256: 7d9e2d42e5d6d46b47e4ab827ece9db06979de65c36e3cb939d8e3fdf7ad1dd2
font_01_sfnt_off0000fbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F4 16748 bytes
SHA-256: 7765e95ba63bf5338fce1cbd3f4d6e9c196bc7bb4910d7f4f7fbbb1a9c0c0f15