Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64afcd430160e9d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-14 02:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eebf12abd34509278de56f3ce91ff354 SHA-1: 9c2b7049ce237af8849759b5b05a29ab72f16f7c SHA-256: b64afcd430160e9d9260812bc56bc45e9b7cf526c324b73c2082fe0502809905
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://wastran.ru/uplcv?utm_term=change+your+habits+change+your+life+free+pdf PDF link annotation
    • https://nocnepal.org.np/ckfinder/userfiles/files/58532176719.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/64876412164.pdfIn PDF document text
    • http://flomojapan.com/upload/files/92514379022.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/82495887546.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/25429081116.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/51190962039.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52004531743.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/sipiwigugofa.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/jorug.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/meluvegepaxefekolome.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346a53a9c90---lerilowogodikowubewepotuf.pdfIn PDF document text
    • http://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/84526280950.pdfIn PDF document text
    • http://beijingteye.com/upload/files/7764948107.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210902041506.pdfIn PDF document text
    • http://techbis.pl/files/file/lagulanubi.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/julevojisun.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/bifalupituvezozenef.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/reruwalukuwev.pdfIn PDF document text
    • https://baongochoa.com/upload/file/jigijosodo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae062703b---kasefu.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/teboloduluzixuxosefudu.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/62711243580.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea8212d5f---jajive.pdfIn PDF document text
    • 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_off0000e123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE123 11284 bytes
SHA-256: 3cc7d357a8cc51bef7b226e807e85fcae6c36b51fc4c79d2001e5405101d5be0
font_01_sfnt_off0000fb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 18872 bytes
SHA-256: a506bf1ac90aff342836cc6c1d1464879a9efddebd9f582d2f1883219c4713a2
font_02_sfnt_off00012bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1