Malicious PDF — malware analysis report

Static analysis result for SHA-256 f263f9b59e36a104…

MALICIOUS

PDF

75.7 KB Created: 2021-09-16 04:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: caf7aa3864097527edebb0ce7a18f331 SHA-1: 6e2f9b2fc23f6cfefd987cec6e61b0543a1a0e87 SHA-256: f263f9b59e36a1041fdf684e427f9c5bffb825cfc6ac1b3fc9d684f5e28b68b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://inwebjor.ru/uplcv?utm_term=watch+the+simpsons+online+free+putlocker PDF link annotation
    • http://khamtribacninh.com/images/files/45380703771.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/17568456412.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/80280018782.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2b6008ba5---83789554277.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/b02627iod5nrr8nc1h6n4cmq6t/revibi.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210913180850319.pdfIn PDF document text
    • http://freestyler.cz/img/file/remesubiwunowodemaz.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/44730048268.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/mupewakenunove.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/funobofulovusezuxuvijasa.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/kagexoloxaradofabidisoto.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/rejuwilabekukaka.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134245179d72---motigirewolavipifafomim.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16134234bd0711---98557459841.pdfIn PDF document text
    • http://yuha.be/_files/file/ruzowuregijevamina.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210904193138.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/mowojisofunopagef.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136671270eb2.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/petudoxojutitiweteremoz.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/57885867016.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/gitafuzuvogawadopagema.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_off0000c1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D7 10928 bytes
SHA-256: a6f9c5136e863796325e7cdc602b8d7189affd23e50603ac02932aa1fd3e71b1
font_02_sfnt_off0000f2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 17904 bytes
SHA-256: b4d61e3952b9ea18a0b84b06429e4a6282613eb94e442369064dcc8380480b86

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