Malicious PDF — malware analysis report

Static analysis result for SHA-256 9883a06fe17412c1…

MALICIOUS

PDF

91.2 KB Created: 2021-09-05 01:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78f4c840706c471d329dbb0360654958 SHA-1: 28a6b11f9e7730d498b675c73e0d33f852eb399f SHA-256: 9883a06fe17412c1f75e52ae5613bfd5fc374c6f98d47fa7e1b5a8fb41573a3e
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable or compromised hosting suggests an attempt to obscure the ultimate destination or to leverage existing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/vh6djfolj75uj7plrru8egco21/96844756174.pdf In PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0cce92e46---2693165656.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/685fe33a4cc7f1789ef51b9279ca12f6/xutagopodedogu.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/pugorakikuradura.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fdfa5f3ff0c---82241068427.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5c8a99073f6e37f3f2e9fcb5bd3ddc09/jekevaxebabizumoweb.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/7353856805.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/56465614029.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609457dfe47ef---bubuludetidelapami.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/e3f695f3290c8322b5d1fd592176bb93/wojizunaletomirojunu.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161103782634f9---kojezegonezu.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/177423749.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/vebatofezolexotefudefag.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/22275573768.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bce38bb02f4---zojorilesuxadijomum.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16099e70cbae03---joxalejuvafovepowepolu.pdfIn PDF document text
    • http://89928386.com/uploads/files/202108180157478808.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/supotuzigozibulasuxebev.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609010d331fec---kovumumujo.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608eebb4602f4---jivawiliruvufebimopadad.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210528190335.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160982a44edf41---bulamovixogumosewem.pdfIn PDF document text
    • https://morabia.fi/images/file/jojawabawazitiveled.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/5a02fcd1ac735bb86c5327803c5b844b/48300281917.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608856d665a20---50831664674.pdfIn PDF document text
    • http://jpcadonate.com/clients/4/48/4863a0bac697dd4b44f4a1b1fb44835f/File/dodimarov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=introduction+to+operations+and+supply+chain+management+4th+edition+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE88 11312 bytes
SHA-256: 6c9dc221b24299fb54fe0275b7d713e462e16d18f114d829b81df4f1cca5b46a
font_02_sfnt_off000118cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CC 17352 bytes
SHA-256: 8b865455a589e8b21c7776d5c520fd2e0c32011186f753b03848a5c16f312428
font_03_sfnt_off000132f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F7 16772 bytes
SHA-256: 3a379da5c6e4e862393a1835c7621c1caa43d8037eb2c770abc74ea68a899d2b

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