Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4c43cdb491ba10…

MALICIOUS

PDF

70.9 KB Created: 2021-10-01 17:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 11ef7f3807fada150679a041558a5508 SHA-1: fb2affd28e6289128e95c8f999939e53816db179 SHA-256: 7c4c43cdb491ba105e301849d899fd423c83a18b68c6a367a6464de7b8f555fe
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which are hosting other PDF files. This structure is indicative of a link farm designed to distribute malicious content or conduct phishing operations. The ClamAV detection and ML classifier strongly support its malicious nature, classifying it as a phishing trojan.

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://catamma.ru/uplcv?utm_term=optical+illusion+wallpaper+for+android PDF link annotation
    • http://quetthe.com/upload/files/42284718320.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b84610d6bf---61246092526.pdfIn PDF document text
    • http://sinners-party.de/media/file/gizesanuba.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa922a123d---dodabelewupoxofewo.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/3f5ae0cc29b1a2b48d11533a755f749c/369989584.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/jakag.pdfIn PDF document text
    • http://104408017.linker.tw/files/55930514211.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/16972445272.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/xarunaxad.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/novugilizerozam.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/gaxakemoze.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138e9ef78305---69825749653.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/dunerigipoxemagumov.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/pomijidagixibofefogopez.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/15972857414.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/gemifov.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/16696649069.pdfIn PDF document text
    • https://kettosallampolgarsag.net/imagini_ws/8252313008.pdfIn PDF document text
    • https://akvaguru.hu/user/file/28836062418.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/76051406872.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/7841970104.pdfIn PDF document text
    • https://servauto.fr/img/user/file/46845025355.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/rotux.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/jafiboxop.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB4 15808 bytes
SHA-256: 064a845e5d91841e93d2c69ce8500125b0334faf7664c082c5cca2b0e51a85c2
font_02_sfnt_off0000f277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF277 10824 bytes
SHA-256: 8cd34ff6e3fa03f1c1a116789850f2c21c8c62c18032611ae5f5796e3684e2f6