Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b01617fcc81cb1…

MALICIOUS

PDF

96.0 KB Created: 2021-09-01 07:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d68fc8f1c315aaa7b5b9b29623d71a72 SHA-1: 5c25d8486af420b839368ad01ce1e227cdabc23c SHA-256: 56b01617fcc81cb1eda24dc4508e8109f34e1782e10fbf6bd2a184565b468380
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised or disposable hosting, likely intended to redirect users to malicious content or phishing sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination through a large number of links across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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://aitrans.cn/UploadFile/file/F1202108090021263260.pdf In PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fa276487c---80586078730.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/35384656976.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bc6095eae0---48448131329.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/dusid.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8889fe6492---wanazuzozasapuselofape.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6747fe78d6---47767763452.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/kinenotabotivusa.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/fibujawonogiwovabatesupi.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/37611826708.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/xuxejunem.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/8029661520.pdfIn PDF document text
    • http://chpcentre.com/files/file/88663489744.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/83855212356.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/a9f941b759b3f0bfee31d20b4648fc56/fevudifajed.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/101e65dec2203891a449d560793ac388/xalipevepufawepomogixe.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d34f7d6d22---16023645030.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/66768291410.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/figudemijax.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/87374612990.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/76947054413.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202108310657143958.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901a7823e5e---18126657247.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/df8c202811dd860a51475b76d7f067b4/93958067234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=bryce+canyon+in+novemberPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5B 20732 bytes
SHA-256: 36a3f795eb1bafea95882eba2ca76525d40957ce6b2d03dbe1f324f53c19e8e8
font_01_sfnt_off0001423b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1423B 10452 bytes
SHA-256: 2c29c9885dde750c6f8815daf7769e6510d916bec9d9a5de65ba7a78094efa9a
font_02_sfnt_off000159fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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