Malicious PDF — malware analysis report

Static analysis result for SHA-256 10822e1b2d268a1c…

MALICIOUS

PDF

70.6 KB Created: 2021-09-03 05:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a0e36dde5d3a58e1431e6ee2ff6f5562 SHA-1: 46b15027fcc475f545522b369259c69424d37572 SHA-256: 10822e1b2d268a1c2b0e54064ec26483ce81ecea878e45ecbf07e3ab4c1f5fb1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links to external websites, many hosted on compromised CMS upload directories, suggesting a phishing or credential harvesting campaign. The presence of these links and the overall structure indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ketchas.ru/uplcv?utm_term=resistance+to+organizational+change+pdf PDF link annotation
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c38ccd5ae53---gifekis.pdfIn PDF document text
    • http://ipceurope.com/assets/file/zoduralarepusenituvat.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/d9e42f9f5a7ce16336db6cb0dcdce97b/wosokazuzidoposazaju.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/simisibuwomoberojizigode.pdfIn PDF document text
    • http://lulanjina.net/upload/files/59408256982.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/66531529907.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1622671763.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa0892fab6---zukuduteleme.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ri321luj9diroulttgoqgedsap/36285953144.pdfIn PDF document text
    • http://yejida.com/userfiles/file/xenufirababez.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/55289763240.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/zulukaxedukot.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/67973806140.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/8916c839dd30bbbc9e598cbb8635f1f2/91567709777.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607797bdb3ffd---49039529406.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/29831745313.pdfIn PDF document text
    • http://sun-tes.ru/files/file/votevudebenototuxede.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/g6amnodptff3st23lqk8a46100/82191976931.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/filugapupaxiwijepozagavu.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf120bcd504---22877648323.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/somelerudawogefevifi.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/64265971475.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_off0000b69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAF 14812 bytes
SHA-256: 45f467fa6fbd7cd9191e3956cd3f8145f3606620d406b88c7ae7218b6ce340a2
font_02_sfnt_off0000f3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A5 11004 bytes
SHA-256: ffa586ef2b4c16d4d6a4049732cab716ae717065c963735661d4833eedfc96b1

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