Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b20ddb3a231625c…

MALICIOUS

PDF

74.1 KB Created: 2021-07-22 05:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 49a09c4dd6f86798f57d48659628c5f8 SHA-1: 8750f6cd455332f82050f51a651693394e3f8047 SHA-256: 4b20ddb3a231625cb8a17fc84d2d22d52a5c9bd4e111aa8b3d5e52d4ba4ab84c
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic findings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://yeosingol.com/FileData/ckfinder/files/20210712_25F3156A38AB05FF.pdf In PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb68d51e4c0---jefazemalole.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/romubilanemakim.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/22100225740.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/zefurubepanurom.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/22uooe5uj9n0fl8qobbfm5o8t3/vudumel.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/fea31f70832416ef8b8e9cdd1b66bc71/88465502984.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210630120239.pdfIn PDF document text
    • http://prestopc.it/upload/file/rijirojuzafugewebos.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/d735c6b3b4cbe7f08f78e40cae468e04/betaresizejusamiwovub.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/81508399602.pdfIn PDF document text
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/wipamomulazijalavop.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bf8a24e6d---keworitofobubawokotijox.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098393dbf2d2---15972810487.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/a08c84f506ef577f51ae0fe1ef49a624/wezelanufilufo.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/pad49qtughdsimuqfkjo8vpvm2/13297837807.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160cba8b0c2536---kojuzirok.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/5897406165.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210706011144_i5kkhx.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160945fa2c790c---86978810002.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1f3a4944c---86839265238.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160d23a18942c5---83730829580.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/25108776353.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/tuzososowitiku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=after+it+is+donePDF 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_off0000c0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DB 16480 bytes
SHA-256: 2e3bf8285151a3e2db39498907d365e13136f5c6ca435d9b0b713715474cae3e
font_01_sfnt_off0000ebb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB3 10120 bytes
SHA-256: bc3bf224d4175e4c2a350f1d98e52afdee575f6f760e207eae5953089f9c5b68
font_02_sfnt_off00010271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10271 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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