Malicious PDF — malware analysis report

Static analysis result for SHA-256 c412f526d753ca5e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 01:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8a377eed703ef2558e3a0a2f0782574b SHA-1: 089f885951291fc97346782180cd198d9f5e3b9e SHA-256: c412f526d753ca5e0cff7f2d854f7ec6c5174ebafd70dce00cad68513e013584
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a88eccb367b---74846536602.pdf In PDF document text
    • http://metabolit-plus.ru/files/file/18166626834.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/24459868994.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1b8761cb2---saxurevurupezolav.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/44621400191.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/44900518179.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210725083544.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/betuvedoxagoselurezagum.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aa18c66b16b---najomipuvefe.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a39a35e5c54---fefadibodexivikab.pdfIn PDF document text
    • https://rajatotogroup3.com/contents//files/kexekenigipilala.pdfIn PDF document text
    • http://elitvorota.ru/f/file/39406383658.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/detif.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa468951a4---21467054073.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45494193357.pdfIn PDF document text
    • http://compsult.net/userfiles/file/77318521003.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16210604821107523669.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/70399230144.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e25596568263569af717939771c1ee31/xifenagapufisobikekigakuf.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076926b0a166---59421839132.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/pafuvavukezav.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/c2okn78ds4bdp4o3hg0u1b6jt4/81722960447.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/95646592820.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/18337042619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=nolte%27s+essentials+of+the+human+brain+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_off0000d882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD882 11016 bytes
SHA-256: 7814bf1d3f79f56bfd9f4b5adaba1f7603f8a5a038406d4b1c4b78045e7e4676
font_01_sfnt_off0000f1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 17164 bytes
SHA-256: 73ba019d04dcc5ba1890d01c84ea71bd74e7b3df854c9408c2a0e11e3733b1c9
font_02_sfnt_off00011e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1