Malicious PDF — malware analysis report

Static analysis result for SHA-256 817a455374e23426…

MALICIOUS

PDF

89.9 KB Created: 2021-09-16 16:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 896e07febdea38147be7ba2a568881b5 SHA-1: ea55f2906823c04bddb68025688e7b47e4e580d8 SHA-256: 817a455374e23426e525cd8d290002121d3315eda070067fce8517ab11758ff2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://coretry.ru/uplcv?utm_term=rocket+launcher+apk PDF link annotation
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613143d08b04c---fupasevanepatijopogofad.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130eea446464---13149247634.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161357ea49f7b2---68051426592.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/6267167386.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///kedoxudugunepetidedexiw.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/2e115ff088c2ee37d5a258712353c93d/gabemed.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/24608268445.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/nemoxakufezupuwejizilo.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/xasubef.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/resoni.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/13400879513.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/7r9fsrmgsihh7lhphdsj95g6d0/27225960631.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/nejipevajuruwewejukanize.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/58873728453.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/somexazanaba.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/28679455222.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/bopevemefadove.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/18586464555.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16134fcf9546d4---9596083449.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/69283616380.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/bokobanati.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313907c8ce4---pufulomogesem.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/gojikorufad.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/47836432152.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/ligusopukefajuvuk.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/jaguso.pdfIn PDF document text
    • 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_off0000ddeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEB 18192 bytes
SHA-256: 5126e2e02e3612c7c8ad320bd6a70ba90b9a34c1a3c20b3388453e8e9f26b4a3
font_01_sfnt_off0000fa00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA00 18400 bytes
SHA-256: b75148e78a50fbbd7c40aaed74ad6d592564367a3be4e1f666b4f78abe01a71e
font_02_sfnt_off00012a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001422b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422B 10448 bytes
SHA-256: 2288364a02c649df87dea6e349f74250cac617a37acaf313254da1c4da19dee6

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