Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15948ab5280f048…

MALICIOUS

PDF

78.5 KB Created: 2021-09-08 23:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4e46ce0e53816d1395996e67dc4f31eb SHA-1: 590b2be1a3281ff0a58557e6991d2609e48db0f7 SHA-256: d15948ab5280f048ee7760e34e642aef2557032f04f5ec2b4433f625aa1a7e6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external links, with several pointing to compromised CMS upload storage, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://loveperfectionschool.com/upload/file/foduruloxomefufivala.pdf In PDF document text
    • http://studionegrelli.it/userfiles/files/87187416940.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613371b309c73---94891248167.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/xesudebeki.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/11394935298.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/bejagokonugedutug.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/mudivetosonemopiz.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/58784059758.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/58769566541.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/lukesuzejuzilapipusigul.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c60dca849---33817310086.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137bc10c98d2---20690894316.pdfIn PDF document text
    • http://pedraferro.com/files/files/18574336983.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/lubevurikuviremikip.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161389e35d0376---zawatikobubozojarojowiwir.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/31406744230.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/83077211976.pdfIn PDF document text
    • http://altus.pl/userfiles/file/33726515384.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/kabidoduzizukifufival.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/jibijitumawowuzi.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/34090613478.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/vubevujatokafoz.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613648b967eea---52903165206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=is+121+a+prime+or+composite+numberPDF 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_off0000cbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCE 18068 bytes
SHA-256: b44564c35b8e3a5729b3976f9afc80f43f3a68c8c20717c01de32de95fc34b78
font_01_sfnt_off0000fae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 10852 bytes
SHA-256: f060293b700d5b598a7b8cef5e81366e6b337d5131fc3e3e08fb75cc843d516a
font_02_sfnt_off000113e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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