Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cc286448ac886c7…

MALICIOUS

PDF

111.8 KB Created: 2021-07-20 14:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 888f3d6bf9ec4e972be01f2d9fd30a8b SHA-1: fb79c33acd8819982e2b68f756deba127a4b2cc1 SHA-256: 2cc286448ac886c7fa9d9ac766c22e8ce2f05b5e3fb4286c9462b5e1fa6f89d0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised websites that host further PDF files. These links are likely designed to lead users to phishing sites or download additional malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/3a8ca2b502f491740218b08820cd9eed/90140385019.pdf In PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/tukaxo.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/403f9c3e4fb745cf309f344029776088/zusejosokugubi.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/tisoxigufadibewivezur.pdfIn PDF document text
    • http://poorclarescork.ie/images/vajekifeberitawoxujupapum.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/6060629021.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/sijeguwifotulawutax.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ck6qv9tikb7giv1g0eqr0ndhj3/sufaf.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e831e147b---gikuxiken.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a8ec0b0e9---foduxoruzakoledud.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/kuloxu.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/fumorudenugeli.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/lonenid.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/zanipasimavepexivofu.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/14978502683.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/91344981085.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/87724524982.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16084b11b91369---jukonafodotevuponuxebesov.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/893d8d5a9c78958be22a60d94c94daea/novabuxu.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c75414c833b3152a830603fd8a818873/98156269449.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/qfmek9faomou3ojtgsl67mfqh5/vovawebisurodixo.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e4763c09c793d7177fc347bcaead1d32/badez.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/domeganelila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=red+pill+mentalityPDF 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_off00015406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15406 10324 bytes
SHA-256: bac76f93c156c89b348ea173d91b0f314f3f8a24795b311d1dd0922b8dab6062
font_01_sfnt_off00016b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B3E 17828 bytes
SHA-256: 76888605d1dfb27b49cee2eb1fc1e96ab571cda2953a94b2e1e739dafff7519b
font_02_sfnt_off000199fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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