Malicious PDF — malware analysis report

Static analysis result for SHA-256 a715da2b4f1a8ac3…

MALICIOUS

PDF

98.3 KB Created: 2021-07-17 13:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 25da5b106200a50bab4102cad1ed0b10 SHA-1: f7868ff368b75b10f77cb0e91cc6fbe5856c3edf SHA-256: a715da2b4f1a8ac34f92cd0a13259f22079dcf1f0f0f218d266bec91269997fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, 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 delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/77fe9687c6eb9fff9cd211be9477afaf/vabipebemev.pdf In PDF document text
    • http://www.aqsclimited.com/EditorImages/file/92302618755.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/18052890.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/nibofujexatigikowoze.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/mesom.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607248104ac83---41071817523.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/ebe60da8c4b448c6d6921d43471d35ae/jiramelovonovav.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2745bed775---xovexesefofukixopovatox.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/patib.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d477ebfdd5---25416730300.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb558c383---zafelixizurado.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/pifajolixifabekewojomuma.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c010b807722---movoletazirozadokevep.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/9517062564.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160782a87703d0---89108268625.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608253d0adc56---3594070055.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8c080dc52---kotisasikelixadiwed.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/94517348557.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7e63c306e---puseranevupiv.pdfIn PDF document text
    • http://gchsclassof1970reunion.com/clients/6/6a/6a45fbe13d63dbb0eb8070d7cb9dbc89/File/56342368934.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/kuviwileza.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a0420d5f972---37655741599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=bhp+group+limited+stockPDF 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_off0000fb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4D 10940 bytes
SHA-256: 50f0f2bc9079d92dfc1d7d4f1a3c7e4dc61df05d805f4815a7739210cf5c1b9d
font_01_sfnt_off00011479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11479 19896 bytes
SHA-256: 2d6bd495fc4d18bf513424223dfc5c10ccde3e1828f2ac7b3bdf64ba229d4bbe
font_02_sfnt_off000147f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F5 17920 bytes
SHA-256: 6a531e77044865578e8de33615662f9e7394dc1dab08ad42d96dabe94392dd82
font_03_sfnt_off000163ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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