Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95b3774a922ba21…

MALICIOUS

PDF

79.1 KB Created: 2021-08-02 22:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 021099febedf1a521cd358d56f48b70a SHA-1: c5d07fc69a290098ea35ca4ec73c0f9f1f1fb541 SHA-256: f95b3774a922ba214f7ce40867512d5f38ed3ae0bfc040c4bc134ef59b0e20ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. Numerous URLs were extracted, many pointing to compromised WordPress sites hosting PDF files, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate this document is likely part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://oniceh.ru/uplcv?utm_term=sumas+de+dos+cifras+llevando PDF link annotation
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf7b173c35---zelesirowamesil.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/1lj8eq929o8uer1viarh2fb4d3/90174443068.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/4eef467aecd9272ff0f42fee64106e33/zulaboxifezoxiguv.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33a465dbe8---29073623892.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c611908a29e---xirozezevaradabegigoso.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/8341516368.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3218da9749---jiximizilegasuxumugimefe.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/17ea0ab99043dc31ceb3050cfdeff625/kisopizobikigapuxav.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/49a3047124d90aa216065d562aac17ab/tomutapa.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/f8d0adacf4af34e25877e01964d8e780/56859739777.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/rutevuzexusuf.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d739caad---35868252806.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074584b82592---30181116443.pdfIn PDF document text
    • http://carolinaboatclub.com/userfiles/file/21528191475.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/naxawufosox.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/78783024806.pdfIn PDF document text
    • https://abeess.com/userfiles/file/gegilofep.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6fad9fde8bc4e15f21a096b505b64bf3/fovodimirolef.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d04feb18e3---29798123464.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/24450324275.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/b2efba48a50ba0493a4fad09b7c3dc6b/fovid.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_off0000cde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE3 17948 bytes
SHA-256: 29aed53366936d9c0ab2a8b23a23214466c0a375850daccb072e565b35400d06
font_01_sfnt_off0000fb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11397 10780 bytes
SHA-256: 6c21ffe6e4acb2b6644f41d3803dc91f8180ce883881d68f593b8e5aeb8e5eb0

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