Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f237b5949e8c9fd…

MALICIOUS

PDF

80.0 KB Created: 2021-08-21 09:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 96a92c62034b051f38ddeec5cdcf7924 SHA-1: 4dddcf587e5a11d0e0eb6b1468c38f4a850ff2b0 SHA-256: 2f237b5949e8c9fda9432c8ed691f8a598699e103f73671bdb1eac087ad1f2fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://oniceh.ru/uplcv?utm_term=passe+compose+imparfait+plus+que+parfait+exercices PDF link annotation
    • http://biancoacolori.it/userfiles/files/fakisabujuta.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8a6c85eb9---gubifes.pdfIn PDF document text
    • https://themalc.org/files/file/50601579766.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/aj5d8rfl9fu5o25hgdp1oa39mq/66851372200.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/22524242096.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e05ca69b32---mapofufipatoxomon.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/11885222205.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/si3a78fbcilv7imab5gp9lgoq1/mubadeda.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95d77aa68---87295565757.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/707961d33124d4b24d5b1f39a824c0bc/sedudax.pdfIn PDF document text
    • http://salkim.com/userfiles/file/voneg.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/456879775ad79108b9028d50d1eb0f7e/sumurojep.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/tafamagudekonubapefazexe.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ed039bc89a1---26906466510.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/60432713143.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/76291640192.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fac3ba31d0---bexijuxapujemuz.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607921a2801d3---paputoziwin.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/javexotuzefatilezojuk.pdfIn PDF document text
    • https://zzhqhi.com/d/files/motesagaxiwitewitugupize.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b8ac8886e---pedomodevu.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/80600870092.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/wajesuna.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/8b375d38733d8cfc243b518914a60767/tojuzojuk.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/dejuxizisunadokebef.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_off0000cf7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7F 19272 bytes
SHA-256: 1b9d4506e352fa206559b736a53f6f5331073f2a81332938d45417219c93a24f
font_01_sfnt_off0000fef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001170f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170F 10888 bytes
SHA-256: 81135fce94e6df2aed7edc6eb063356778edefd2c62f77baea7d5235bb248d87