Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8b7b424b84e152…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 02:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d3a17cbc16628f01898d3f53248328e5 SHA-1: 9532c168f66126806e284ec8702b8db8b51b740b SHA-256: 7b8b7b424b84e152df8b1ed64b783096dbc247214d1646d91c55088b505b086d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ClamAV and an ML classifier. Static analysis revealed it functions as a link farm, with numerous URLs pointing to various domains, some of which appear to be compromised CMS uploads. The PDF's structure and the presence of many external URIs suggest an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://shidoremicrosys.com/media/71556432693.pdf In PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963901b77e6---77857648183.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/85440550101.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/82260065805.pdfIn PDF document text
    • http://sun-tes.ru/files/file/lubaxareribufebe.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/tizekizesovutemoge.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fc04dd7f0---poregokogaxemogo.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/woxotekig.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/gekevododemijalaliw.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160cb30412df51---41323582383.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3bbca6e3d---35689274491.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/venidexunexitofifuwaduzep.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610e4e43c53fe---gobijemidoxokexasigud.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bf60f008d---64942874219.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/pkkna002595af16e320ivtn1j5/36283460659.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/wazixowu.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080f6a12d447---nolebupem.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/9gpfh8akejgdcfbavfv8u5t5p6/niwavi.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/89647020461.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/44580031597.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/56e2f487c42a9ed05f03eee398274882/pupuvopazadawizodagag.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/levabuxunimubak.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/a7df28e7c630f32fbbde4d0e06782a00/kanepusotugunepomuxis.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/papixadoferuzudutapudosil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=bastien+vives+petit+paul+pdfPDF 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_off0000dc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC32 19888 bytes
SHA-256: 7448ef8b782824a947230e3de4a12ca8a0c8feb9eeaa6240022b6d93a36db679
font_01_sfnt_off00010e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001263c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263C 10488 bytes
SHA-256: 6b842a475182dc2e0924ffbf74de6aa35c621026d8310355db7f84f6b6e11936

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