Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa1fd93b3a761f4…

MALICIOUS

PDF

98.8 KB Created: 2021-07-01 17:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a0242cac318953f1e152522d07da041f SHA-1: 821048dcf3fa102f57ca23b3d340f274504707f8 SHA-256: 5aa1fd93b3a761f4edf13e557bf7a769ba39303b88c96655d0ffd2e81188bbf8
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised CMS uploads or hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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 http://am-assets.com/aom/magnolia/userfiles/file/2771328190.pdf In PDF document text
    • http://curry-box-deluxe.de/userfiles/file/vugaw.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/16977781982.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a05d599068---bupapisefiwududofazuw.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/brdo2f1lo01dtbtm3h4nl3sqa7/14681904121.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ce35d1762---nebemotusozaxosojuxim.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/fa3e990c939e872cab11c4a39cb63a4e/29517886907.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/71936528603.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d91ec4edc1---dasojunawulezurome.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/bdd158cc45d43a8c9a894ea4033d097a/22904239550.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d5f643b1a40e910b2084d7f5cfd89189/majofovuv.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/1fa02a9a2fa49c62e1b8cb06dfa164ab/venimujoregixigezubapini.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/22219673759.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/xodujediwafigudawesupaj.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/6amh1n2665n752br7feb026bf0/14062740886.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/zunivaxobezufezejixozukup.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/0eef4fd0a646e48455fa084fcaee55b1/dapomujas.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/tusqti8u4hd3cpsnacd1dre5b4/37477344812.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16099a908542b4---19733895916.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/78081480056.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/toxifowisokemununamokoli.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/48803188474.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8e693569c---3709881548.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/wasigogimelibiwawokuborev.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbe95963e7---51545141415.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099bcc47366e---pijim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=decision+tree+used+forPDF 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_off00011ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA1 17704 bytes
SHA-256: ea53d746e86a1be482f933966eef1e26125d4e8005ec90ac54050c9e1e4e1236
font_01_sfnt_off00014c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C8A 10364 bytes
SHA-256: c255dff3d48c890b2e6a98be4a2fcf774d175f8a85cd608920fb910014be9506
font_02_sfnt_off0001641a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1641A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1