Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c95695741d881d8…

MALICIOUS

PDF

95.9 KB Created: 2021-07-25 15:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d18239e446f8f225399f3c47faeafe51 SHA-1: 0eea99bc812b51df4f2b80b39dff8c0fe9d066a3 SHA-256: 1c95695741d881d82a1247c0dec528db879af925bf0651111e7e1fc61685dfe3
156 Risk Score

Malware Insights

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

This PDF file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cmcthailand.com/ckfinder/userfiles/files/soravorel.pdf In PDF document text
    • https://fertilizergranulatorprice.com/d/files/23513126035.pdfIn PDF document text
    • https://coluer.ir/documents/file/polinubonomisujimuwojewob.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/e0e43571df6617945d638a6b66e80afa/perevujopakidunuxakobipis.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/dujufubilutexus.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/c1d0e06560c56da04fa18fb53ec1e324/62073421891.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cd8b8a288---kipedobifegawemonuwaveg.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/79750133691.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/e2b81343646208273fabb020687f7f08/27280506034.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/75006148117.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/3d6521a7beb80ef1c94e6effeb474234/3583465469.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/e5365063c127807e0797b9a797290474/88408614292.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/66157460807.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/biwesififemoliwexuvofubuz.pdfIn PDF document text
    • http://banquat.com/userfiles/files/zoruwalopesifojerube.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56873066580.pdfIn PDF document text
    • http://potlista.com/file/files/nezade.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d236542231---11814299595.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/df7ab69c06ff4308d57d79f026caa016/bubodinudixijedak.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m3ilf8sin58c67a032h03866r3/34587549513.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/tofafiperoken.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ms1tm04ij5ilr9kjf7t4jl47a4/dowelaxozibugas.pdfIn PDF document text
    • http://digifast.cz/userfiles/75123992901.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/63917854205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=requirements+to+be+an+appliance+repair+technicianPDF 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_off00011199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11199 17248 bytes
SHA-256: 819206a2b0a03ead5f4fb716f81dde729ca971a673912922160e5546bcde1df5
font_01_sfnt_off00013ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000156e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156E8 11068 bytes
SHA-256: 4705a5078e32e1709162c708aaf6aedb448430cc9c0c259afaf41a5f7b86c2bd

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