Malicious PDF — malware analysis report

Static analysis result for SHA-256 1510f65b9c18f744…

MALICIOUS

PDF

82.4 KB Created: 2021-09-03 20:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5bd1427661e8c9ca747a1597981e3471 SHA-1: 344e7838ab71a0a9c2737a1c7bb9f3590f0c1635 SHA-256: 1510f65b9c18f7448e5c04a101061b722c91cd6e6ce6646c8fce373c3f7d1f79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. This suggests the document is designed to lure users to potentially malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=super+attractor+pdf+free PDF link annotation
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822dbfe0047---33531564170.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/3e6e01464fe98a1799cb10f3733b6d72/6506718808.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/velotoba.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/jeviseta.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/kupumopu.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/rofaposek.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/jisebobexolapun.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/gunufevobipufotivigoma.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/70300837278.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/tofoloxaramumonolavata.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b535ee02d---xiputozipimu.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a21d74e7264---kawimebemakipanasotepa.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/84435339856.pdfIn PDF document text
    • https://techlan.pl/files/file/52290087168.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/lakekizavisodakumutivalo.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161036a34c8636---52094425047.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609748246ca1c---96778747951.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/bekagurumowovutise.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/8c48e851180fde8a22ad06f1b4334026/75657438658.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/12267937121.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7d3a60d9e---puganowikulokoja.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/81657373755.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca2e9edf22---56211200390.pdfIn PDF document text
    • http://tyextractor.com/d/files/29764254601.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/tusatidubuxalopimu.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_off0000d9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D7 19472 bytes
SHA-256: 9463c95787d4593c45a8e8ae48e2d0be1a4e2aab6ee0cb4eb7ff540cdcdf7d75
font_01_sfnt_off00010cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB0 10376 bytes
SHA-256: 4b3686f1a1ad9f049ee6cb4d510354639456cc7c8ec674d61829d71f783c0261
font_02_sfnt_off0001244e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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