Malicious PDF — malware analysis report

Static analysis result for SHA-256 20cefc336a597272…

MALICIOUS

PDF

91.3 KB Created: 2021-07-02 10:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 94efd90a3b52cf4785b2063a50c56497 SHA-1: ff69ededc49a0fb1ffd70fa385c45b170783c00f SHA-256: 20cefc336a59727227afd2a7256f4a551a398eff2f6b5bfd572c37bc8d58c741
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing pages. The presence of these links indicates an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://philabc.ru/uplcv?utm_term=what+is+the+shm PDF link annotation
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/94719658286.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/34032736296.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/1d10c2995299c4af31bdee4e90e73eb2/nebak.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8886dad72---76769693976.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/28323595407.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/73054b263a30723b6410fd075e711134/47386334719.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56250bf8e5---85113612543.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/e5172d69436f0def5858e852bda29558/momasupanewewevenoraj.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/35e8184d7927c901d611499b5433eed1/siwonitejetef.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073f7331c44d---kelopifunekifakip.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608068d76f2c7---lixesanoratefepuda.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49371d1ec3---91692498593.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/sogezilisa.pdfIn PDF document text
    • http://chapelguild.com/images/usr/zufakul.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ec489c11004dd1aeb6600ee6f6d3b269/jewonofevabunudivesosizi.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/8gkvti3uqp5brae88rk536fsi2/32107579313.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/b17aa8e30d4f8e76308eb2f2f006fce4/75693765565.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/29701883803.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/lijulaxunosanoxagowon.pdfIn PDF document text
    • https://iwistw.com/upload/files/30141550942.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_off00010226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10226 9996 bytes
SHA-256: f850db88920441ceaf13cd20a858857ae5f54db97b41e3d6d6c4e498ae1fc2fd
font_01_sfnt_off0001185e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13070 18132 bytes
SHA-256: 18443670d0c34dcfdc760506450195331470034ac6168e535237b06301b58a2b

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