Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7386adbaa265a64…

MALICIOUS

PDF

75.4 KB Created: 2021-09-07 07:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e5c74c0a8f00c400a841dfcfac07568b SHA-1: 11c80f5408edc976c31e60d92f9db977a6a95b34 SHA-256: c7386adbaa265a64f101435818adc23ac739f8b1fe2bffe333391052029999c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload storage or disposable hosting. The embedded JavaScript likely facilitates the execution of malicious code or redirection to malicious sites. The high number of links suggests a link farm or phishing attempt, aiming to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=past+tense+irregular+verbs+worksheet+pdf PDF link annotation
    • http://robvancampen.nl/userfiles/file/98732793102.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/22292673031.pdfIn PDF document text
    • https://tsegypt.com/file/23650217424.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/11493520683.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/59772013893.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/3f13057431443d2757b7edbebe34283b/memunadipalu.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/10930886255.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/45ae1a880f17bba152d1c35b66d2bc9f/25519470438.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/29192102723.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083730ce2d75---dodibapik.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/0c9e2f9c42ea02696f7b35c0aac12d45/govit.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/32192145590.pdfIn PDF document text
    • http://martonelektro.hu/files/file/fidugos.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/denuburabaregimubuv.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-12/20210512053139534031.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/33199227433.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/39950854407.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb86a5f2cc---fegasugifutirifatog.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/kr9p6r657n6kk4v867hgltn283/fipofaguzikanek.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/bdse3kdi8rhgfvjvpac3cu3a86/27946509127.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/miwikixetotidipolotafes.pdfIn PDF document text
    • http://muszempilla.com/files/file/40018855340.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/33675297035.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f256228fa---birus.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160c02ecda216c---nawefetijupimanudirumilif.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_off0000c1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AB 11264 bytes
SHA-256: 45dc670154dd0361efca6e3bc61918a970404cb5f95c56423dcb70f481398d1d
font_01_sfnt_off0000dbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAD 17060 bytes
SHA-256: f0de7c03d1e15a243578055da4ffab2964542d5c81bc29a9a4ada4e2b7ad733c
font_02_sfnt_off000107c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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