Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffcc112457618748…

MALICIOUS

PDF

87.2 KB Created: 2021-06-26 03:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 96b1cac8cba8cf6a7bdb4a50a88d4da3 SHA-1: 6134e27466eb0f141e3d07b120675adbea81c800 SHA-256: ffcc112457618748cf11cf5f1e52b735a0edb40788d45011eb859028366f2132
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many pointing to compromised WordPress sites utilizing the FormCraft plugin for file uploads. This structure suggests a link farm designed to redirect users to malicious content, likely phishing pages or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://inwebjor.ru/uplcv?utm_term=man+up+meaning PDF link annotation
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16092c92870cc1---12599563314.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609305cc524c5---76250957989.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16099bfb17c6c2---5609047052.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/xipibixekagubotuje.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/56570625312.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/8d83a612838393fb1b4593c26408c130/49233518196.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/8fhv3ullk7p1737ul20d9p9qni/73972926040.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/83585195f664b64899e5e0a5a3a55cd2/92196641315.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/31216618323.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608657dae6394---47964974913.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/60148278398.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/a21c8be564ee3ea8504a31ec884f9678/99141856120.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/62003892000.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dd5cc05ea---44074348186.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bcf7aaf64---wimupimurazomebam.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/nvdraoh57lt4qvdon6rbct4440/wakekevazejejiw.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4691d1b00c---damanazifinid.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/69437949314.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62662898801.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/aa9055452ab7aed55d999055eec0883f/rigifolegivana.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210607155022_m7vk9v.pdfIn PDF document text
    • https://serka.com/serka/upload/files/naledi.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/72833990443.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_off0000f26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A81 10156 bytes
SHA-256: 16a0d6d8ea224c718d45f675b65065802f46bb4b406de9a1fa3195244a70e0c0
font_02_sfnt_off0001211b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211B 17764 bytes
SHA-256: 2c8e7bf569fa7c94184910a4cfdccf7cd945621223e051e86c617b4ff3b36703

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