Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62549971d9f3311…

MALICIOUS

PDF

79.8 KB Created: 2021-09-19 05:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6c32ece0728eed2e26e5d15e9a372cf9 SHA-1: eaf38ade326d123ff3d778490faa1ee5f3e6c4e4 SHA-256: a62549971d9f33111b9964dede55b5908c90efcb3088ab57a2b83843544833be
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to other PDF files hosted on compromised websites, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inprovitcentroamerica.com/ckfinder/userfiles/files/zisurejovabupebuz.pdf In PDF document text
    • http://archifolder.com/userfiles/files/66666870866.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/7344446261.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/falajuligamasenegabe.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/mipajajen.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/27820792053.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/55190271374.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/76118891855.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/891a4bed6ade8c6d616e117f4ceab742/29543173513.pdfIn PDF document text
    • http://terminsk.by/pics/files/56132338700.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/28946471687.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/jatib.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132d4f434f01---familalanigasezogozupiwe.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1630646572.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/9285213709.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/34233021123.pdfIn PDF document text
    • http://theponghop.com/upload/files/mezutevezosodibefujomevo.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143307991811---ravesakakuxokupaz.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/vuwulumepe.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/44037878263.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/fetebidikeduripuzunow.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/liwinegaxotosadij.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/36149215717.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/nexevevabozesosilulukif.pdfIn PDF document text
    • http://belniig.by/public/file/sugumatofakusuvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=inshot+pro+hack+iosPDF 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_off0000cc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9D 10336 bytes
SHA-256: 34e1a81b6f7c50898637a3c23a8e96256d12843f0e36b46000622a91aa8d5138
font_01_sfnt_off0000e3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DF 20748 bytes
SHA-256: bf53386536ca8d41aceb9fde9c677ef36c73338b45f48544bd08451233b6165e
font_02_sfnt_off00011979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1