Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ddd82bb2bca7d2…

MALICIOUS

PDF

82.0 KB Created: 2021-09-01 17:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c5d96304923ef87ffdf71b698038515a SHA-1: afd6bac3d23275baff142a7d37dd5d6541664c63 SHA-256: 36ddd82bb2bca7d29c0c907004b7c609cab2136bcadca3e4f4528aaf1f3aa79e
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. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://studiovalecchi.it/userfiles/files/73940728367.pdf In PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/u5hj4jlv2c7u1ck6smnikpok3t/25814558404.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/it3fn7fh9761uaef6kb41gsum0/luxegopadinopar.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/pidawosi.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54f95ca48b---82086040976.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/83503902001.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/c13mti8bbpalq1rlo7gda44ouj/80387601367.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9e51a030---vigoxikebojufusamibilejot.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/giraxakisopitagusesa.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/44631413970.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/gonexosorajawekavexuselek.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d6c48451d---wisugedegosininonez.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/zujakuniwefalub.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/vuwuzore.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/13681245760.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/xawosovezesovatumepis.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/159724eb2a28dd53f29092eb6680cdcc/vamikugurud.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/zozozasabajonozanewifewo.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/pimobumofenemajonuduzif.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a021c81c92---55722492284.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/6f577ac6549118536af322916fb03ddd/vizizobagig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+many+star+jumps+to+burn+1000+caloriesPDF 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_off0000dd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0B 11272 bytes
SHA-256: d88cbdf332f92934c7248cc9bd6fb42e9fcdc118f3b8958b4d6eca392dc6aa96
font_01_sfnt_off0000f750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF750 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F62 16552 bytes
SHA-256: a3888a5a130cf70e5132700f4ad0e72e8bb53e97b1939ceb8e36d3103136f420

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