Malicious PDF — malware analysis report

Static analysis result for SHA-256 f138814ffbbb3a2c…

MALICIOUS

PDF

88.7 KB Created: 2021-07-25 19:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 31a105a6e825a78e9cf8169df7d654bb SHA-1: 4218f851a3f3665f775231aaade355cfe03d1dc8 SHA-256: f138814ffbbb3a2c0e0bd073a7948c7d236f1412b1c64991a0e578047d6f73d5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload storage and other disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/f66cf73d09682f8d7d1b03d05b65eae5/fupulitodotifuza.pdf In PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/333fda9840c6a56c560d897f95cd6fc3/49287619070.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/435d2d11eb2688de10c0f2fe64f7934d/jawuvimaxedewe.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/86547297865.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf5f771560---nebukap.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a961b9e36d7---luxobexok.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ef828d5ff---71160621670.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/9790341899.pdfIn PDF document text
    • https://vijyaiprismcrm.com/userfiles/files/32736774555.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160962234c9da3---47513037776.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a499f45a541---fesikasam.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/1e9f56d9effcaec553c1047579c7b81e/49925956730.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/naxonijevusavonu.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/fd626e1e14fe1483c1d8c86ae8feb32f/24869175001.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/76181807104.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/5f5625713729b3090bd562755230f61e/wekiruzuxe.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/baluda.pdfIn PDF document text
    • http://phs60sand70sdecadesreunion.com/clients/880504/File/22848199590.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/22822891200.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f0cf1b4e4---81223446376.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/8382c6fc31394dc1457be502e65c06b1/62227068355.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/35857593980.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/b9a39e5145a60be41ab4387d5952e812/wuwijodekolavu.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/48794801877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=tratamiento+para+la+diabetes+mellitus+tipo+2+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CB 18420 bytes
SHA-256: c74bd5ba2da0f99016eb705b6a5f89983450e9ec5c70efdec4b596a1ed59e05c
font_01_sfnt_off00012062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12062 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13879 10980 bytes
SHA-256: 964f6a1a5ac624064fde55d27f26ec6beb34a10783e05063451fcbe6a686d57c

Open this report in the interactive analyzer, or submit your own file for analysis.