Malicious PDF — malware analysis report

Static analysis result for SHA-256 af402120d7d34158…

MALICIOUS

PDF

93.4 KB Created: 2021-07-07 11:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7027c988e3fc49d81bd690e6a7a9dda5 SHA-1: 07eecf0e3d064919615968d327ce74ef688df3dc SHA-256: af402120d7d34158d036d8573b1ec9cfa4c05a6316137fd56ea66f9e758ef7ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/83791302614.pdf In PDF document text
    • http://www.deopendeur.org/imgUser/file/fevobukufudofet.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/61ac7528621ca547b19963329756a028/84556705156.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/gixamugosofutovibaza.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/48180684563.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/75872715443.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/780fff6cf440bd54f3dd33eb12130c27/6098991034.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/a4d01893ef5dc60211e16be37453b6c6/17400117356.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/18872708450.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/fujosavisomizuli.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/wapoleribi.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/sezifumisowapo.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/6492248241.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/1lndlvmh101n559q4gqq2a3fp3/99731516458.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/dimalolida.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ce39040c148---renexedeligazetofunav.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607056bb732c9---wevafonixavoxinaj.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/75e90361d072d1c4b21e58572f8aed39/88788648225.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b062c9bb7---viwirejotokuvujuxakowilo.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/5qa2r9nl0ocq5bl5t64itqa4n2/87040467819.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/memiru.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/8200dbccfd2efb49f5df187725ec7a23/jugilixitadim.pdfIn PDF document text
    • https://actor-conseil.com/files/file/nedozevosowisuge.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/bde102bb0166b57983aa317ced20e52b/75772168876.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084ffe51bf66---jopowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=hbr+valence+electronsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 10328 bytes
SHA-256: 8cfcb2de8170144a7c7357b500bf7f5ff16800355bedf1d4bc26729facd21703
font_01_sfnt_off000109c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C4 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_02_sfnt_off00011fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA0 17608 bytes
SHA-256: 528649a7933c8799994ef9f74999a07877ef5462fec35a8152b2ac8938d2f64a
font_03_sfnt_off00014e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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