Malicious PDF — malware analysis report

Static analysis result for SHA-256 e522c87bf5ad9735…

MALICIOUS

PDF

96.3 KB Created: 2021-08-24 21:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b0ed01c815038a4b660114f4c713ba14 SHA-1: e284b6eb92fcd03b425a745e4a9695c5ad30fc6a SHA-256: e522c87bf5ad97350924ccc3254c3415b3e06efb7af6b40b89ab89596aad60d6
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dda390bea---mutibitowod.pdf In PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6a4896d37---pifuwuxofiwobopugenama.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089dd7cea109---pibuvolebologopegav.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/24782929144.pdfIn PDF document text
    • http://ca1970.com/clients/10044/File/vebizivizukidaxa.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/84314723949.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/34717748434.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/43147291923.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984c81e85b5---77020842438.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9d4pnaumrbc29gmp407n0ja1d5/48595453576.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/30026f2cbe8e5ef297d68368f0ae4635/selanukefa.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/jivipub.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/78203762187.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/venizomobufakuzin.pdfIn PDF document text
    • http://icwest78.com/clients/67591/File/rilobefirubefotuw.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/0h3fcv0p3hi3ik3u6or6lij2sa/nebodow.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16100d427b6e5d---62087327536.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/pogiwujifinujemeta.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/dobelujoxozasonoki.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/40047012644.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/rowatuxiwuxizepozexus.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/sasadali.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/lubotosefosa.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/52533932535.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/lesegopijowametiriv.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/a53d06b37ec240cd542172c048aba923/wevenawitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=our+environment+todayPDF 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_off0001171e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171E 10500 bytes
SHA-256: 739894141b951b56145cc5c9fd384561fc48325f302ce04548cf9cd40f8093d6
font_01_sfnt_off00012f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14716 17104 bytes
SHA-256: 51da4c4c7b4412c09ff88362bda7c8cbc4d40c4dbbb1522a255b0414f2032007