Malicious PDF — malware analysis report

Static analysis result for SHA-256 d14a4135423fe40e…

MALICIOUS

PDF

82.3 KB Created: 2021-07-10 05:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2f4f3db9f5c42327da814a79d42c53ec SHA-1: 4d43e0b1c67aebb546041cc6128154b46d9502c0 SHA-256: d14a4135423fe40e3766112eef3c9e663e07634c16ca29c19a1feb34afc5f164
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations or disposable hosting. These links likely serve to distribute malware or redirect users to phishing sites. The presence of multiple external URIs and link farm characteristics strongly suggests a malicious intent to lure users to potentially harmful content.

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 https://medvor.ru/uplcv?utm_term=direct+and+inverse+variation+practice+worksheet+answers PDF link annotation
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d829e3f10f---gadutezaviradomuwuzepad.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/subibesi.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/6ed4a3706f0a0259ec23753eaa6f011f/97821509481.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ed578b678---wavijalizaxepezazafefu.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/dugajonodivekibi.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af64753ee79---tuwunogedewibas.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/84303239489.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feed5b9014---58817821453.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/89624025618.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a03d0b454---534198352.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab92604aa9b---nadisudifipekede.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0d4aef9ad---11963291014.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/malaveb.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/1ab0b1257b5ec0646819a5f6bc83ef88/dofegezepatetafiseruje.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15f86a9da3---90855671140.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc071cef7c---gosoxavusifagufukore.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/92832c8ae62ad3819188cb93d17bfe3f/10352028930.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/jojapezasepiposo.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/f618083ea23974ec410643d3fed299f8/4399347072.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a604f61d32c---76813802243.pdfIn PDF document text
    • http://www.heksan.com.pl/file/mewudubid.pdfIn PDF document text
    • https://vieclamkinhdoanh247.com/upload/files/80814937985.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/dukuliv.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/51778185576.pdfIn PDF document text
    • https://aedwea.com/upload/foto/sujuzejukozubusetorig.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_off0000ddba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CC 16948 bytes
SHA-256: 31a789af20e3c6f4282ecc99b9263c800395f770d848ecf6b594a8602e990004
font_02_sfnt_off0001223e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223E 10812 bytes
SHA-256: 89b84a3340b036fe0b9c6f16092f49e61b53a395626d224ba623fd8760567f27

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