Malicious PDF — malware analysis report

Static analysis result for SHA-256 953c59200d4cc377…

MALICIOUS

PDF

80.4 KB Created: 2021-09-07 22:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c50feaca974450fd7f9b98cfbc0efd8e SHA-1: 1bea12eb2a34cee2c4c8ec5bc2c6c69c1e1f3f43 SHA-256: 953c59200d4cc37723e1d79388226a5466a4766f221b8e210534553db0baeaa3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to other PDF files hosted on various domains, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the structure suggests a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://vipnovini.bg/root/f/uploads/files/pijirotulokuwekutimif.pdf In PDF document text
    • https://solidpractise.com/files/userfiles/file/rizorojelopamukifamo.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/85442614774.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0f9878408aae297762847104ebce26ef/womed.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/f4o03qolaindh3gh4q555chma3/86951936649.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/6ed46b3163f8115e76a2bc9776768b12/lowiro.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/jomotadu.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/libafonaji.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/fapoxifaxetowekeselonub.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160832aa6657e1---90630386091.pdfIn PDF document text
    • https://akemi.ro/hirek/file/mowedolosiwowibiganu.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3e6b09571---95814636255.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/rokimowopovog.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/u4j8sc2iolgsok2lri8jvi5e0u/lovizoganepomimijese.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/0c99a4f5a74bcefd13078cbdb939b74c/bajefezuguwepiramuro.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/dalujuzanulefijasi.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/97645370211.pdfIn PDF document text
    • https://maviet.vn/upload/files/76788974279.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc1527ab95---nobezowamajidajulone.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/1320ed26bc6b3d022e9c1919444870d6/jisovam.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072343a09fdb---49083133543.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/16661304891.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=tcl+uhd+smart+tv+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD841 10420 bytes
SHA-256: 407569c9bb66d7d515dc1e32a38ffb338c9a29ea9308254a2015354fb0ff443f
font_01_sfnt_off0000efb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C9 16912 bytes
SHA-256: 8695a66eaf90ccc94711ced853ca284abae305f9e0633c2e0f98c58000822383

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