Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae54d9af8c41041…

MALICIOUS

PDF

100.3 KB Created: 2021-08-21 23:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 2a55b876653ab23fdc05f339cb69ddd3 SHA-1: cdb9f03a8ec8cf99e0a79efe4674a77faae6952d SHA-256: 5ae54d9af8c41041b1fd922078583fdc20d893216be192df615a243698b844d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d5840e63b6---xebajaperepaze.pdf In PDF document text
    • http://vanillasky-ch.com/images/files/pamupo.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/dagipuvajunamexobane.pdfIn PDF document text
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/43146005927.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/48715998484.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/silalo.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/c68366c9d7f46a1fcf94d45891ea363d/21104218874.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9cf61818e.pdfIn PDF document text
    • http://navigator-33.ru/media/file/milimigibuvaw.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/984b5ee853a7e754c06d22031b1f70e6/lenomivazipaluzewitojewul.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/relelabivilaxuvol.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/c9a17f6d8136f01f6182741758f9e038/70794535103.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/86389057653.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608472f3d11d2---2234981237.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/guwenov.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/vufurovawudorot.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a061874a3d0---12765416893.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/c0faa45882a0bfdca1102664aa631c3b/tupobufinotasaforif.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/83840405225.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/zonuxetaxoxe.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/lu08iotpmighroblll8ofeoum6/18802526824.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/ra9bpfvh6lfen39s5i6akcu5dj/sumapazalivefo.pdfIn PDF document text
    • https://trunglamdecor.com/uploads/userfiles/file/kivijeputegaveve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=diccionario+biblico+strong+en+espa%C3%B1ol+para+descargar+gratisPDF link annotation
    • 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_off00011c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C12 11036 bytes
SHA-256: 83ed4a6126d625a3a7f5dacd0ce3424b66d7d4ad4657e45233c905139107b631
font_01_sfnt_off00013535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13535 19456 bytes
SHA-256: c6afd6526b2b61ec9bc87451f36a5081b7d0df72bcc426abfbc128f222aa93eb
font_02_sfnt_off00016732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1