Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f85dc734273325…

MALICIOUS

PDF

74.6 KB Created: 2021-09-15 21:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: acc540e49a483e7d842af9328cb091e6 SHA-1: cedffbd380e1627da9e91acfaad20e0e6d15c22b SHA-256: 56f85dc734273325463df752c7e1580236bce7b89ecbb468fa8dc687216330b2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://chcial.ru/uplcv?utm_term=watch+cinderella+1950+123movies PDF link annotation
    • http://www.deep2001.com/images/library/File/voduwepikekuwevarete.pdfIn PDF document text
    • http://indemo.pl/Image/files/22585111439.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecdcfc8bae---87072997759.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161356ff4d3158---laxovulidojomipefasad.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/texaver.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/magolomoweda.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/10768854152.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/riranulela.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/binezobiruxiralalomoki.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/sogig.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/vekagijimexafunavesi.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/vudoxik.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161418df716d3d---54671745026.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/49929498666.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/jepimulowasexizaxesujapo.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/53326001861.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/vinig.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/95770562655.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109042009384638.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/jeliwar.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/17736108993.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/95756760805.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/84452913010.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_off0000bd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2E 11460 bytes
SHA-256: 8c47c30599d543f00fd35a3b794b9bf9a3f168be0ab1167044272d863c84737b
font_01_sfnt_off0000d842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF054 17248 bytes
SHA-256: 8bac1a1c5a5165b407e0cbbccc06d78ec5833ae1e4dc77f877e9728a5812e0db