Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c5bfd535cb285ef…

MALICIOUS

PDF

93.2 KB Created: 2021-09-12 20:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 040a6857d95b3615a10d5a19daaaba7b SHA-1: c8d4b27bcd820abee2e34f7ae7ebd41afd90c6de SHA-256: 2c5bfd535cb285ef2de3e93b9a4926d13096049ec12c1320d2635667e49d51a0
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document is designed to trick users into installing unwanted software, such as browser extensions or updates, which is a common tactic for credential theft or further malware deployment. The presence of numerous links to potentially compromised or disposable hosting sites further supports this social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://idominjazz.com/fckeditor/userfiles/image/38545012636.pdf In PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/67883661569.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/jagonebazezapugu.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/6562083954.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/55994951635.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/zodugigolezaroturiwogiwop.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331e0ba4787---84822622759.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/bitamubazojuse.pdfIn PDF document text
    • https://unitjaya.com/contents/files/17402936888.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161395426d6e72---velorawajunokobekepugiz.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c80b253529---20851519600.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/sokotutakumivumipodosu.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/4531740375.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/wizefaf.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/60048390737.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/jerajasotu.pdfIn PDF document text
    • https://baongochoa.com/upload/file/28761727150.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/xitexa.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613494e8490a1---pinore.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/87714109864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=will+the+moto+g+power+get+android+11PDF 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_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 17920 bytes
SHA-256: c16d050dc7db37fe3301129219b9e852e62f2462a1ff04a0ef0b68b0a4e28ee6
font_01_sfnt_off000136ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED1 10804 bytes
SHA-256: dd6685b9ee45230b989e41184381b33beede11068bc4daa50b585adc61bccd47

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