Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81da6f7a23c10fc…

MALICIOUS

PDF

79.3 KB Created: 2021-08-08 23:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 741a00f6f07b887d5b0bdc942e3a8dcf SHA-1: 8449d5913261ad7f510b3423445dfcfdc36181cd SHA-256: a81da6f7a23c10fc5c39db4d0876ef9cc8147e1fb22da82a241ec475714010c4
156 Risk Score

Malware Insights

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

This PDF document has been identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external resources, likely for phishing or malware distribution, as indicated by the ClamAV detection of 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://vilocom.net/webroot/img/files/51868991994.pdf In PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/03c6df08dfd08d07ca876abb67866621/52336958278.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b33b1ca15f5---jimalemijexatedilobibe.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/84351567496.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/57938481753.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f05dadb0cfa---sesegogajirebobij.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/e7ffd3e0a08acc6918e872f3c9b9458d/sisub.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071236027d46---rekivakonofukoxifutu.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d65a489e9---58224158225.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/b2e6d4fe5be67af6e1f7c90d40196acf/larikovinemezavatokis.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609972b1545aa---lesikow.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/20700815821.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b442fbdb---8416606235.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3041ca987732643aa6f4fcb83c6c0d89/zafunikotamaze.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160811f6b2ba0d---53016916832.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/7942a2589a41da34aac196fc96126e4a/lobaxowixo.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/14837440999.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/kritce9sk8ubbnl6ur2g2tg1tk/tavujudomimix.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/minupadogutikadekudalufe.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/66783885581.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/68626054740.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987861f1742---zebesufanulujazosojibur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=dead+target+unlimited+diamond+mod+apkPDF 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_off0000d0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DE 16984 bytes
SHA-256: 88ee29ea19069112333e3ca80e6e6415020be45f2a2ff65b21775769cca65fb7
font_01_sfnt_off0000fd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001155c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155C 10760 bytes
SHA-256: 9b9f0e82f286c91bf433cfb1baa7f28f447c73a77df0e5d44395be28ab41e7db

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