Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9e261843f6571d…

MALICIOUS

PDF

92.0 KB Created: 2021-07-08 01:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5c373218019edc46abd7fb30e9105d55 SHA-1: 0038d76ac8ff770b178aa8e21501d5f650f51097 SHA-256: 7a9e261843f6571d52de02bd893e5b9eaa1c3d8bfda071dd9a19c1a40e9259f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable domains, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://hill-macktribe.com/clients/7/78/785e88641dcef8d5cadf71fa969cae92/File/85369150416.pdf In PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a06a53e4fa8---xival.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/14510961241.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac5dbcd0b6---99398942066.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/kowexim.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089289f18c87---kinutegakovavefizizudu.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/4589379679.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/298079030.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607800a72f6eb---mitod.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e23462f2c58---45172863880.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/46283125733.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/bezapo.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/tatarininerakutoxav.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3671548ae---reduvokazubezene.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/womejigimoxupaledogize.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/b70a1538975980015926df52520ec9ce/naxolaluraxidigigota.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d786789f57---24822362063.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/nuzuzevopefado.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/580f4f5d52707296ad59907e2bd3d0a1/23079658852.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/jizejadisarolisuxeged.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd28069dd6---44325071047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=gazed+at+meaningPDF 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_off0000fe84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE84 20056 bytes
SHA-256: ed3bb3fc112bc2009c7747d766b431ed643cca75b764db972a08aa53bc62f1cb
font_01_sfnt_off000132b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B7 10256 bytes
SHA-256: 7c054bffa59f7ed9363833de270da7b3eff0be01ea40f2dbf5117405718603bd
font_02_sfnt_off0001498f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1498F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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