Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8d5d1472f14446…

MALICIOUS

PDF

109.1 KB Created: 2021-07-25 09:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5f630e70b4571d7a9818707d2a00cfcb SHA-1: 66c9dd10fa9ccfcb45c1cec4ed6ce87a4e78d1fd SHA-256: dc8d5d1472f14446279325c81267376af4e6a92fd2783a3e34836f8a920b0516
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to host malicious content. ClamAV detection and ML classification confirm its malicious nature, likely serving as a lure for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088d20357433---giseti.pdf In PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/4e2f3eaefd6946000f497220e9d41b1d/naxunokorazezadeva.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094aca90d269---56776591605.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/nebogawimuvodejexurekag.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/gividom.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/90791566491b69ef2a0129050cbdbb10/97716270441.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/jcekfua41jk6vg2bbhp5mfgf66/22987688431.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/4e836ff7f846f33d89f78a23f79907ef/35224321605.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071ef1baaa6b---18431944484.pdfIn PDF document text
    • http://4bx.pl/public/file/84259434684.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/somegigalasevawizadirafox.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5985ce858---33341650910.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f52c92236---63379204645.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/78fd25d792f6dabeb7a05d16a9c862c2/bugeriguruweba.pdfIn PDF document text
    • http://faradbox.pl/files/file/87174839207.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/japaguwatanovofomedata.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/0io6mvhn6prfvpo1a36bi4gtf6/90659995273.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/lariwotubonumifalobejaxo.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/73017570277.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914bac6d822---jomadofasef.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/62371429678.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15b036b836---jazad.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911d58bb26f---posazazidimojipojerenaf.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077e1f6982c8---74372476356.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/bfa297d5ad2d62aa83cdea72a2521019/kajinumam.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebe244e50e---juduxomokerolubekilefufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=identifies+the+common+propaganda+techniques+used+in+advertisingPDF 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_off0001435d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1435D 11284 bytes
SHA-256: bcd6662a3e47974a02893cfe163a7a7e66ef7159b7ebcb00575413634e4574dd
font_01_sfnt_off00015d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17542 18464 bytes
SHA-256: 080ca60b85e7be3941f940fc0b9db3d77f934bdbffe953509b073312b3f14775