Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4522d1c4b0b738…

MALICIOUS

PDF

85.9 KB Created: 2021-06-16 14:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a8e02f6ac84c2c24b04ac4d7061250d0 SHA-1: fe1e76e31dcb6cac492703431b22e73b7fd439c1 SHA-256: df4522d1c4b0b7385aaa63b062412195587661d611560144e00574d7fba885bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised CMS upload locations and disposable hosting sites. These links likely serve to distribute further malicious content or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://coretry.ru/uplcv?utm_term=%25D0%25BB%25D0%25B5%25D0%25B4%25D0%25B8+%25D0%25B1%25D0%25B0%25D0%25B3+%25D0%25B8+%25D1%2581%25D1%2583%25D0%25BF%25D0%25B5%25D1%2580+%25D0%25BA%25D0%25BE%25D1%2582+%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B0%25D1%2582%25D1%258C+%25D1%2582%25D0%25BE%25D1%2580%25D1%2580%25D0%25B5%25D0%25BD%25D1%2582 PDF link annotation
    • https://ntwbearing.com/UserFiles/File/52981165020.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/apotiwewupuzilovevafonez.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b458118428e---95938674155.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dca1890552---12124369038.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084c920aadb2---wujarazepirameno.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/91d17e4fa457603a494fede8d7fec167/48825829352.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/vl034sc77imd8p0um42paq9kfh/nowogujazafuwitisokotojo.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160711aa32d4c7---duximopoxaxivesupi.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835c7626205---jimuvefilusekemazelux.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/dubemefexu.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/bfjhrrkdelid3re85ngq4l5d21/97086947761.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b43a0a564c4---pugugulebifemunoratuwalon.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/859001645.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/dbc92ab46eb28811b63fb31e5f13497c/53433096715.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be31cc483a1---63455143625.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ff663113d7fa341b56ccd71457999ba6/wojuxijademew.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081576b19b16---leduripeme.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/74046057955.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/a371c5276c7689a32deca100678d7170/18863893934.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeba531fe21---gidozeden.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D7 5056 bytes
SHA-256: f678cbcbe7b694fb6250a3904b77e587c92812a04450e136510e9b8e4de10f2f
font_01_sfnt_off0000f42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42F 15404 bytes
SHA-256: 69652899e0484c0304e59d95447a77dbe7533533d730735371a85f59545c4dfa
font_02_sfnt_off0001237a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237A 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
font_03_sfnt_off000138a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A8 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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