Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8e19e076546da7…

MALICIOUS

PDF

92.6 KB Created: 2021-06-28 20:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: cceaa3658dcacbd72e1c86f3138bb4a2 SHA-1: 6c8d60f5477e83e5535764a4cbf7d6ab916d50f9 SHA-256: 5b8e19e076546da73169d25c76caae818cc1d712683de7b0219781be924238d0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://aranykoronakft.hu/userfiles/file/44915903862.pdf In PDF document text
    • https://menu2uplus.com/images/file/55564214248.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd70bbf351---tujaverajifogiror.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/2c77d45b2aa018e13e0d826ea6e53acb/dowekizovenafutalo.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e99e046707---4093854325.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/valewer.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/50862047501.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc3e68df4a---17741241089.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/2550112003.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099475624903---nusowamewak.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ad022f17---wewuj.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5327294a2---57472744655.pdfIn PDF document text
    • https://dm288.rs/slicice/file/vanopevajidaka.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/5i8tsjaeln1dverv811gnra221/5638502761.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7bef9d02a---14597787671.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/woludikotokov.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/tuwibesefeweperuzudo.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/xugifenafopoberikaz.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b452c028089---nasuxejorukugufunaji.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072abba2cb8e---lajebuzuwonasogi.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/uefqoka1ir5qmskl222ah7euv6/mafonusajog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=propagating+peach+trees+from+seedPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10837 11024 bytes
SHA-256: e4605f5396d59dbc21e57181916d405f63da35750a354e6757d4412777428f55
font_02_sfnt_off0001216e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216E 16356 bytes
SHA-256: 32a61d067d170ef84ee3f83ad1ba2cadc23e725b0df5007dab6ea629016899fd
font_03_sfnt_off00013768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13768 17184 bytes
SHA-256: e4aefe65352718bf6ed81e679c4c24bf112b07e81fed9ab7642131bec87d00e4

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