Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae85958f1eb964cf…

MALICIOUS

PDF

89.0 KB Created: 2021-08-13 18:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e1b4e92dfeef29b9046356de9fbe863e SHA-1: 6ad89235d9703f4afe54e24a736cd6960a672897 SHA-256: ae85958f1eb964cfba41d47c9686e555c2f5dbd49d811dc10b41883c8c1d780d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking any user-readable content that would indicate a specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/qhhn94ai19dc7i2dlsia14j2c4/26565943198.pdf In PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c2b541aa6---futewirugekarojipalezum.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/60df6c95fa74826aacbd1e669a4d4ea9/sudisukofededatugumimop.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/p9mpcggo29eo921ag6ifpa0no9/84684818902.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/7173535136.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/86710375162.pdfIn PDF document text
    • http://mths1965.com/clients/6/62/626de2090e8268457c7577d5e8b87900/File/78617246896.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/24558176612.pdfIn PDF document text
    • https://laser123.com/geektic/files/pisobuxo.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16072e903dfd35---92627400428.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/18074458567.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/6686bf91137a3007cc62f28a480790ca/kulixinipo.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///202108044252_213942116.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/vifixowedivalorob.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ee7r3rauaqhhobamb9n025iop8/kusufusipew.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80464160278.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c5117c17a---20458114110.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/vazodevetedi.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/89083147360.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/48227550783.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/sekagakib.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16086d87152dc6---ruxafixuxevufon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=hollywood+horror+movies+tamil+dubbed+listPDF 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_off0000f5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 10904 bytes
SHA-256: 1f1ffee5d80e68cace94e13b3ef16f451f1917eb1f875e79a04cd52fbe2dd90e
font_01_sfnt_off00010ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF0 17824 bytes
SHA-256: a471cdfad8542e87a426c95927d022b1cb97661f4b209bd73289a582a8534571
font_02_sfnt_off00013d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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