Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50fcf6d6fa0b1b1…

MALICIOUS

PDF

83.2 KB Created: 2021-06-27 09:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a88b34672a7054c8dcb6541bce04d58b SHA-1: b939d4f73d6baf3d773458d320e30a8a69977e9f SHA-256: d50fcf6d6fa0b1b180cfeed3d91f1524a9c070d9adb728fdede35d20f1c99178
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic firings indicate it functions as a link farm, likely for SEO manipulation or to distribute further malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://garglob.ru/uplcv?utm_term=conversion+of+dfa+to+nfa
    • http://vdadanang.vn/app/webroot/assets/files/14099946573.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4699cdf69---24458701024.pdf
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/86255257285.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701b4a0158d---58607407395.pdf
    • http://alarcon-v.com/editor_upload_image/file/93236106170.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/da3b444778ab353f64930350b6e0b4a7/5381615858.pdf
    • http://naturallabs.de/userfiles/file/77959257678.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/8k3vllns734qpecajmak86jm30/mepupenesopigariziro.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fb542d311---tuwuforifinafik.pdf
    • http://amctop.com/board_data/editor_img/file/202105151238.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/8bec7206c6f15f068770afdc80c70280/zotijoserizivijozupu.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/e0c3f06f8152e156a63dd6b301369c4d/pikamozajujojavojofata.pdf
    • http://wshs67rocks.com/clients/9/94/942520bde836a0b401740df6f3d23d35/File/1427683702.pdf
    • http://mariamozharova.ru/uploads/files/61102841369.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/2d47mc42aam4f3foa1e5imcec3/83545473497.pdf
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/vijonelebuzomujulaziba.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160741cdc05e56---57511357232.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/bfcdf83cc4ecc203fc04fa7213d8c772/30414121672.pdf
    • http://automotiveenergy.cz/userfiles/file/gevawulimoxokoxozuwudepa.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af9699af5e8---89448495728.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/pdb3l2t7jdr83nt5i456eonjms/jotimovejifepupojosuw.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916c17122b5---lekesawulila.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/8a4e21814c9603d93b4aba2ce35cb330/pimisemiramuli.pdf
    • https://ekransamara.ru/files/9762330805.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abab7123792---28369208075.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE47 16792 bytes
font_01_sfnt_off0000f659.bin
24b19269f187b44a1ca095855b78f6cb25fb8b3ee8f52949222a8989c20582a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 18612 bytes
font_02_sfnt_off000127db.bin
c7dbaeea5e485dd38ced4eaa4628ec6d1ccb94119c89dc536f6cce174ea45caf
pdf-font-stream PDF embedded font (sfnt) at offset 0x127DB 10400 bytes