Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27444c05f44d8e0…

MALICIOUS

PDF

131.6 KB Created: 2021-08-14 06:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3528c7f45426ca5ab4a6947fd8d16254 SHA-1: 3f39209695b7b6b525eb55a9b8b046caca6f20f0 SHA-256: d27444c05f44d8e0da1a2828696cf7c9f522e1a910c544ef3284cc489c848327
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the 'link farm' heuristics strongly suggest this PDF is used to drive traffic to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://krisoc.ru/uplcv?utm_term=assassin%27s+creed+odyssey+orden+des+sturms+standorte PDF link annotation
    • http://helloshoppingnepal.com/userfiles/file/52025621536.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099a7e056fa6---fugejaverera.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/16762834711.pdfIn PDF document text
    • https://preciseenergygroup.com/media/zagasuxutegaxip.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/9d2b9c68aaa18c97707c3c4acfa7efc2/rubirodujufelawojawiwetar.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/vororun.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/busedinu.pdfIn PDF document text
    • http://kalikraft.com/images/file/28439501309.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f160a41bd---62414238622.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///56183106890.pdfIn PDF document text
    • https://efnnma.org/files/file/64423242606.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/27050831047.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/gpbnsitstn83hbrtl3vp8ihhqg/43456301609.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/65l902d99cti9itnfrd22ouea7/jowixukosovuguruvanifap.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/5747769811.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a6c9221b479a7dbacec634cfab4c1914/31025677484.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/6si2aa6g8il9uatebldhvsgq94/lebunogezizumirazil.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942c985caff---waxadevibuteserotovejuv.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/moviroxonasusavewemud.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/64744345284.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/84e73346fbedbb085c34c20892a18e04/72246118527.pdfIn PDF document text
    • http://ecole.ru/text/images/file/tajoxasowemad.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/44174128060.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/0deb6bb0fc529ad88f1e8378949af1c4/71018333675.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_off00018ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CA3 10712 bytes
SHA-256: c71839c41eee341384f0163c72a6e29783e474181f4f8ff6a23df5a982526600
font_01_sfnt_off0001a555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A555 26000 bytes
SHA-256: ec51e63c7ff19a4159ea8a581adf333d62608816d747624f22ab2e9817648bb1
font_02_sfnt_off0001e5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E5D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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