Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b0bf9dc19b4742…

MALICIOUS

PDF

78.9 KB Created: 2021-09-02 01:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 352af8c95d8650fc776522c32081f606 SHA-1: c8d3c00c3d79f42d58b2b444df462e86c28ff8b9 SHA-256: b1b0bf9dc19b4742ed0a99a1b6b134682330a7512a95524ec9bf9755ef863589
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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 https://dutchfansitenetwork.nl/ckfinder/userfiles/files/68407342348.pdf In PDF document text
    • https://kudamatsu.org/userfiles/file/75748782975.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/d56e2ccbbf9ec78d5eab14873614196c/gelirumomojaduworup.pdfIn PDF document text
    • http://thedreams.cz/files/36201512994.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/worowepuritepawofoxaj.pdfIn PDF document text
    • http://ca1970.com/clients/10044/File/fakap.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/66942299287e2ffbef2ad9dfb2e210e9/68836146032.pdfIn PDF document text
    • http://yejida.com/userfiles/file/mepuloxonizor.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/jazalevuxes.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/45520600655.pdfIn PDF document text
    • http://computerdoki.hu/user/file/kizagafozafuzotebal.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/29108805359.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f68ed78ea9---4847001918.pdfIn PDF document text
    • https://ottopianos.nl/files/resedonetuwinezad.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/73322878563.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/grltkgt1kjl5v0jq36cqdl5h7n/25057175317.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c65af0e5ba2---23058926475.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f1d82c724---naxojununodizogerer.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/gezikimonetaxekume.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc12d52071---57943297116.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/99949827191.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c2f3f1f806---kunovamurevimoz.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160acfce8c26e9---lujedepogusuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=loose+waves+with+flat+ironPDF 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_off0000d08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08F 17600 bytes
SHA-256: 2b55744742fb79b286b2435554508231c045d4a9ac3fd93c3c5276a4123ab177
font_01_sfnt_off0000fe07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE07 10420 bytes
SHA-256: 3d16cfc0aef871443fb22a926c62e0c1f92645580f53eae4615b38bd49779f04
font_02_sfnt_off000115ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1