Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1a798a69e6de08…

MALICIOUS

PDF

70.0 KB Created: 2021-09-05 02:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5562f4109d91d159d47a9c83f37374ba SHA-1: 52eae8fa03c1f005a32269ad8c3ebce0cf9b77d9 SHA-256: be1a798a69e6de080497cc97d423fcee892370709560b8b1bfc2d7da313f222f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate the document is designed to redirect users to potentially harmful external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=philosophy+of+science+textbook+pdf PDF link annotation
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608559e76346d---tijolanasikulowunux.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/jedozugamimatezexeza.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/83468393498.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae66cfa0990---77889217302.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/28668423938.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c2876a5051d---41143328580.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e66e2f12c---9247426442.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/d6a9d72d2fd83789b08f3ec93af5d698/32483572679.pdfIn PDF document text
    • https://webaprint.be/img/file/zanebenivifi.pdfIn PDF document text
    • http://change-sexy.com/files/files/fajazunezenusewimole.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e99727a763---kukes.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/77859403802.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/39961573413.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/zalojofebos.pdfIn PDF document text
    • http://flexa.cz/docs/file/11292785947.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d2054b1a9b7---luzajivolibigajuzu.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/tizovilo.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ee3b9f346---fugunetipinokep.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/vefarepukakibakoza.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/bavekivebiwunekubidajab.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/fegonenigolonixisukesokex.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1c018383a---duxaluwujororur.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/96805042377.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/69nccisellccs29raq9qeb62k0/31890552452.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/tegizijalebisutemapufivid.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_off0000b61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61E 14348 bytes
SHA-256: c6ac80fc2462987f9bcce1f6c920bce11a376a4aa0a6d4e9f1fa4b3a11b4bbe2
font_01_sfnt_off0000d988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD988 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19F 10904 bytes
SHA-256: 2128e9c8cf698062c099ebe9d4b21bb8771b173e4a36e4d5c4cc919d9ab4eb90

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