Malicious PDF — malware analysis report

Static analysis result for SHA-256 6226124258ded7dd…

MALICIOUS

PDF

102.6 KB Created: 2021-06-26 07:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 62e5cd07f8e1c20021cf8de887d20dc4 SHA-1: a72902592d9e3d5add6e4e0a2f7cb92192cafece SHA-256: 6226124258ded7ddcb8efdefd3d70a34f255f861d90161751cb93ab62b0d8963
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to compromised WordPress sites and a link farm structure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=security+refund+letter PDF link annotation
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0132b611a0---39254618554.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f57ddee4a9---23976717910.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ir5abqu0biaqprkmohebbn7jn3/kumazarujajo.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819d8049866---88191956298.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccd7d529f3---koferekamijurabef.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/cfrg87usei4sm0f74heeg9mel6/4581999242.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160755a82074c9---binejewopixaxaripon.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/332ac559511dd51be1141ba68d62fb2b/kopewunibetilo.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a8b8da8b07e289bd3e02082f0fbf07fc/busepuxakixulekazopurik.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16080f61756b93---munobogubazoxuj.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bc2cc98e1---51954026161.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160724a3d7738d---75226917870.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/52020512979.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/sevarixolutofagazabuxune.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/i0lketq10u66fqdv8mp7thg09m/kenakadinigosiramijagi.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/74946176473.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/c70daa4c163f7e271a328c2d078508e3/rexovusibemeboxiwesu.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/mawadajitoza.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/b1b161f281db002ae1bf94843e539f59/22560058052.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/subabuj.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/2950287a5442296f9ac20f088f7d7f4a/kowufejuzabena.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/sufosanap.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987aef3da38---86819243689.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/fuvagafixiwowez.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_off00013085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13085 10308 bytes
SHA-256: 08b52ec0f7525103a7db6bb22682a822ce0209aeb5218d115c0f7f392b44eefa
font_01_sfnt_off000147dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147DD 17516 bytes
SHA-256: aff3f47dbc8956fa4ec8e460a3a9dba2249f5666ed8a56f4f50d33466b286f76
font_02_sfnt_off00017538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17538 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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