Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3109c1312156e2…

MALICIOUS

PDF

86.1 KB Created: 2021-07-14 05:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8444d9a03a5ad4fa420c7828226c82eb SHA-1: 52a2f17ad6c18c880578020cd0b9983dcc8490b8 SHA-256: 2a3109c1312156e211675b980500ca6dfc2b1a95b7f524282031582a94abddd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://pistant.ru/uplcv?utm_term=new+mexico+facts PDF link annotation
    • https://seerupit.dk/assens/file/kevesemivenelovunenot.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/532a69ccabeba8a2c8332cccb1ce73e1/61998410813.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/75eerqt9ri7qucn1q3qu8ppqa0/riwemedujewodanegupegas.pdfIn PDF document text
    • https://liderpin.com/calisma2/files/uploads/48657169108.pdfIn PDF document text
    • http://oodow.cn/upload/file/2107132149038518162yek74mdz26i.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/1c2321c6e4d96bae1dd60f413f34f230/55735121063.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160824af2dd5c2---1853600818.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/57345899373.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210618_083547.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/refidasupirizuturidam.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/502980361417a71a735d1b741d100b6d/72248542517.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a82483a8836---gawesijowalazumukipumij.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/b76fa9ac24a0c50a49f92fbf123b5623/jobesonegozagufawoj.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/manuwuzunogub.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/69222482160.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/7aoiem7ndjpkvr3l032hiv2sp0/loziviv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec67e66749---76156139076.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/suditura.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/pezalilimisikozaxa.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c65072e65e---gifidotonolizudavav.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c20b75171---13261216331.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_off0000ebf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001040e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040E 10412 bytes
SHA-256: 1d6c90474049e07cf568e716a7fc42ee554eefb08a6f13dac90d331d81593893
font_02_sfnt_off00011bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC9 17556 bytes
SHA-256: 12d6d6463b5d70b264fcda8d339e27aba8e4a2e10fab6b4363cd60e0cb3c34d2

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