Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f0784b9e524aeb…

MALICIOUS

PDF

74.9 KB Created: 2021-09-01 01:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7d610ba48cc365b2551b4e168844460b SHA-1: 8c6f11d0c41da8ffc2d0a46634d309de85b4730d SHA-256: a5f0784b9e524aebbef5daabcab44865e6d960288ac1a883540424efd33cbaf4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pistant.ru/uplcv?utm_term=grandmothers+feather+bed+song PDF link annotation
    • https://majubesar.info/contents//files/61916107693.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/xugiwire.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/wawili.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160945b8f73013---ledexamuvosa.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116a1ebb293e---16983550651.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30630b3a83---jowexevol.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/fugajurexosoxepifa.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/56775674940.pdfIn PDF document text
    • http://metabolit.ru/files/file/muvadik.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/48ba9c4e918261e99f9c457ce69f35b3/vixutefaxedakigifazu.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090322f9a76d---14753956157.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/20023668832.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a71f1ef4c---96600726037.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210603_6DED7BDCE78FFEC2.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094521459b0e---tefakasekuforavemi.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/ruvabaxew.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/orren7j0o4b73ho5i9ucmtviog/50666555410.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/97687581232.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/92902474770.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6ac68762---17446486446.pdfIn PDF document text
    • http://agrion.org/upload/fichier/88455706013.pdfIn PDF document text
    • http://abnicum.com/files/file/49249408156.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/644b37d23a99e2abbbd10cdf24f73e68/pamaxorupetipirivezinowu.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/20866624494.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_off0000c237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4E 10844 bytes
SHA-256: 0365b1aef3be80836433f3a81defeb2b2d1eae1cd2e58454aeab1c952631c4ac
font_02_sfnt_off0000f2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EC 16452 bytes
SHA-256: 7e4db21b574ada7fe1b8fd3f1fad06cf763e61c7ab04275c0cad880210a22fd6

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