Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90afd5be297e8c5…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 19:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c9e39be266e8e21842220912ec23e97a SHA-1: 1788ae2430b1a8aab1c5b8953a599a4adc3c15c1 SHA-256: f90afd5be297e8c5b1d6be9781887c7bcdaa7b4e2f6459a7327b6f10d7a583eb
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded JavaScript indicates potential for client-side exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://indiansecuritisation.com/ckfinder/userfiles/files/63999261502.pdf In PDF document text
    • https://euroialinsol.ro/userfiles/file/24017674744.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/16f093c1673b97626301a9faec38284c/54434527363.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/88326443711.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ti7l8vpijjg3ehaigo996h486f/45737403717.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/5318405096.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/63657144606.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/09838ec2a1b988599e4c15dc559966ab/90463354167.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/lugalavutilivav.pdfIn PDF document text
    • http://acril.ru/ufiles/files/xetepikezobanidejo.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/pivaw.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/fexumifimomexo.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-6/20210906145330641752.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/62376245199.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/90358110575.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16146f03f7f9bf---vosumolir.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137299f84314---rajerutujorajejova.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161309311f3261---94390449725.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/gimumesuxixesimagos.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/12190729884.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/furijavi.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/76439240363.pdfIn PDF document text
    • http://sushibelovo.ru/files/jikokotunemavozaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=show+wifi+password+android+10PDF 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_off0000b054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86B 10656 bytes
SHA-256: aa6518039a7513845bf0d858c0f014964047a80569d987dc4607877493f32765
font_02_sfnt_off0000e0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D3 16500 bytes
SHA-256: 359607382c0f76fc23faa9b04334755b6a47d05409b6294b899e27222d2b98a0

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