Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8c5f1f629a8152…

MALICIOUS

PDF

75.4 KB Created: 2021-09-19 21:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ef6a717533abf1649253c962ba18efe SHA-1: 5ee7e29b2ed937bd1487122b69a5238b52d36762 SHA-256: 9a8c5f1f629a815233e5bab0ad3032c7d75e0b2d7a2f1878731eef82243c81e3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, forming a link farm. One URL uses a raw IP address, indicating a direct attempt to obscure the final destination. The presence of an embedded JavaScript stream suggests active content designed to facilitate redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=android+studio+transition PDF link annotation
    • http://hanasushichoice.com/uploads/files/xemil.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613694301fb9c---31114981183.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613715a5c3b84---virawetekupunaferu.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/31027a9fbd5beb97084c8feae16d47bc/pidoradutapetazonawa.pdfIn PDF document text
    • http://poliinc.com/upload/files/lukoxetofazoga.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a2d708c11---zifupokuwotezurof.pdfIn PDF document text
    • https://j26clean.com/upload/files/neminewa.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/9d6341d438385b008be1ad5afb68fbcf/4715193132.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/66008428438.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/magumijupadizozufo.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/sujufikolulukixirovisewi.pdfIn PDF document text
    • http://armanetti.com/images/lonetadenutof.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/lebudusegutulunumeni.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/71925070013.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/situpixifijideraxo.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16135502471af3---70810517146.pdfPDF link annotation
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebee4e8b67---36018016801.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/jijekupevofokukujupam.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/defunufiparuvokuzazuvig.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/tekutawizalijubod.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/xetakis.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138e42cb3e85---xefew.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614566dd4dd55---19871191983.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_off0000c53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53B 10144 bytes
SHA-256: 89a892ea75e8e601e8806d8a38916e4e850c27939a3c587e58df107f2ee85e85
font_01_sfnt_off0000dc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 16888 bytes
SHA-256: 4f0b2870483fb4d4249f9cd27fa7092563bdb62e6d8bf801fb6be037f2366e6e

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