Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce54560ad72a642c…

MALICIOUS

PDF

70.1 KB Created: 2021-09-07 05:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 841f725a92dbdc48cbf9bb60ab0b86cd SHA-1: 5c4f813c55e5747b111c91633d653275c40830c2 SHA-256: ce54560ad72a642c2131394e771781fffdbe89c38e2717c0e71e03e28324b11f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains numerous links to compromised websites, including those hosted on disposable domains and WordPress upload directories, suggesting a link farm or redirection mechanism. The PDF structure and embedded URLs indicate an attempt to direct users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://coretry.ru/uplcv?utm_term=free+printable+maths+worksheets+grade+3 PDF link annotation
    • http://rakkhunnursinghome.com/user_img/files/22528819585.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4048c8e4f---kufix.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/3c521777317ed235d2726ec59515b471/rijurixeburazunuvatuke.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847091a86c6---vowobamekaretagegup.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/belukunigisarafifatuwepuz.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b4f120df9---mebokakotepi.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd466f46bea---12839091729.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/92407508947.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f2c3aa7404d643244907e3ba8a044885/96130961951.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/67003485859.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/ropolezofafebuxefodej.pdfIn PDF document text
    • http://georgeandmaryjones.com/clients/f/ff/ff66b05efb8f16ea353d8e6908bb1429/File/6937205567.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/niwomot.pdfIn PDF document text
    • https://windscrm.net/files/file/nepekemebilarekam.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/19758787463.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16091299a34007---23017383031.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/26862251698.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161368472c5a14---37771815815.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/giduwivakog.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/zutibel.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/97618971548.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/27110863095.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcfee11b3aa---sogepozuditom.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/81757009850.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/58872933678.pdfIn PDF document text
    • http://richardsonfamilyreunion.net/clients/7/79/79e100fddb184f5a3447a495e7c481fb/File/kogalajagimukiluki.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_off0000b48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA6 11304 bytes
SHA-256: 9de9410c4dd0b3fa8b9e2c47679c63e6d47b2ac3afcf322e5e554b89696ad5bd
font_02_sfnt_off0000e69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69E 14648 bytes
SHA-256: 5e2bfe19a43598f4a88b3cd8d8c44d5e693376545e53f6d8a54874dc64f0c470

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