Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f53437332d1be7d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 15:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a2595632488d6f1f79b70752f07bf0aa SHA-1: e6bcd2e2516e4e76c8c0d4f31e8f67dd23e9cfea SHA-256: 5f53437332d1be7d856679aecffbcdfd7c8bb11941b5b73f606f17ac22b194a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the PDF structure itself is being leveraged to host these malicious links, likely as part of a phishing or malware distribution campaign.

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://laborke.ru/uplcv?utm_term=change+tiktok+text+to+speech+voice PDF link annotation
    • https://aucordechasse.fr/vosImages/xeponusaved.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/jipivizovoxokixirapope.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/25565269320.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/50541650512.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/letirufutalimapinorivu.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/27279317324.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/2fca65e44d055c10c0d76a74ec10b734/11632231726.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132ffd0827ff---wiled.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/wodalekodevez.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/ferew.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/29534779458.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/kagijunowuseruxetixasa.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363dc44864e---girubigosupobenegoxitesu.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/84992717275.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/38708257861.pdfIn PDF document text
    • http://grotech.in/userfiles/file/77817866941.pdfIn PDF document text
    • https://bunianco.com/other_files/File/pozexedojedokofezik.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/sibetedijakela.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/85486346488.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/sepuxe.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/36842519339.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161385ed8f3d3b---30656440427.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/mivibaf.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_off0000da72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 10796 bytes
SHA-256: 6a63fcd1b29d91b59ef749253c56dc222a61f32200bc242318160c5670955916
font_02_sfnt_off00010b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B72 18624 bytes
SHA-256: 8ec308bc21806a2c42dfb885add8993e96f0e8fe71360b85990042301b4f113b

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