Malicious PDF — malware analysis report

Static analysis result for SHA-256 d523469d6dcb61f1…

MALICIOUS

PDF

81.9 KB Created: 2021-08-21 05:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 721c0cfe795c717bb175cc4389754dc9 SHA-1: 3b0a2804b6f518867bb13bf1690653067e5a8af6 SHA-256: d523469d6dcb61f1368f2e378c46f817fd84c0f6226b5ddd817e8052d6569229
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://wastran.ru/uplcv?utm_term=boat+licence+application+nsw+test PDF link annotation
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b049eb7a662a02a8944c9bb1310ab1a7/gifimoridagaxovugub.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc73c670f06---41301503462.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/eb845c2aa8dbd3f04547d70e5735a444/gapokaviwa.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/88066537902.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/bivamawibamelenubi.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb1d50a22a---76755476561.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16087a5c53184a---dudegezepuk.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/13874255700.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161114144a901a---49959969302.pdfIn PDF document text
    • http://esejsc.com/upload/files/66306949799.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610ede46c959a---4683020111.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/30967120387.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/66745091864.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c919dac0e3---1345802432.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/38760023353.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3c64db221---91882273653.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/74948393824.pdfIn PDF document text
    • http://smn1970.com/clients/d/d4/d44d2684521ac238e4bdef02d06179b0/File/65866081710.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/27343958145.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/jubebazezumesati.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacd41f985---2671247160.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_off0000da04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 17760 bytes
SHA-256: b7531519845a768ae88cb53adad940fe4bcff6cc12b81022fdcdfc19e9337f87
font_02_sfnt_off000120d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D1 10408 bytes
SHA-256: 6a85e7a2a03441b8e88d98b5629dac7cffe5e1fce5295972c42dca432886654d

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