Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af7bce824d6c2b8…

MALICIOUS

PDF

100.9 KB Created: 2021-07-28 09:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d88d3d2b3a17577b8ccc88deade6111 SHA-1: ff6b3fc32ae925c6c9573f2d67259b39474e4f6f SHA-256: 1af7bce824d6c2b8250b6a45f6dc9bd01237febdb79abb28e4673af74a7f3704
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple websites, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/fbb004f2d32fd63a577a9a40a041a224/febuduxunixipipijumibuxox.pdf
    • http://pcserviszlin.cz/ckfinder/userfiles/files/87698788842.pdf
    • http://bet-balance.com/userfiles/file/desotunawologodamut.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/cetakque9a4rg5o09pfdrqvdgo/83327005853.pdf
    • http://www.parinet.fi/tiedostot/files/zidemuzekudiwarik.pdf
    • https://cottingham-group.com/cufiles/files/nejowodusilunid.pdf
    • http://bpsstudio.hu/uploads/58394771529.pdf
    • http://veterina-hrib.cz/user-uploads/files/zupulejegitiz.pdf
    • http://chichen.asia/ckfinder/userfiles/files/jabusufetopaxipuwij.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/db038d007aac20ce59aac9049278834a/56485140231.pdf
    • http://whitedwarf.ru/public/images/ckfinder/files/nevelororejunun.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/cbb74ae4c60359f44bfbee22d4653582/kizorudinalerazovamoxo.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a27a73efd12---vuledigupewapelosewup.pdf
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/dilixofofoluzixezikapugon.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b6102cea5d4---29904772620.pdf
    • http://danfilenemd.com/clients/67744/File/20718364597.pdf
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/80939813078.pdf
    • https://aduanaldelvalle.com/userfiles/file/woronotijuvefezaxigilo.pdf
    • http://rkmaster.ru/uploads/files/xulenos.pdf
    • http://hydrogears.com/survey/userfiles/files/63689524396.pdf
    • http://blackivy.pl/userfiles/file/dotun.pdf
    • http://intergeored.com/upload/File/97625613468.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/43039f5015ef90bd241bfc2c9fb97bd3/39295267484.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021515233303875.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=suma+resta+multiplicaci%C3%B3n+y+divisi%C3%B3n+de+polinomios+ejercicios
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B87 16792 bytes
font_01_sfnt_off0001239e.bin
461b0d8a1d1f26479e3915e62ff96c6f6f1b0d792ccf3228e18d4d74e0e41e27
pdf-font-stream PDF embedded font (sfnt) at offset 0x1239E 11296 bytes
font_02_sfnt_off00013dd8.bin
450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD8 16088 bytes
font_03_sfnt_off00015309.bin
399de1d45840a0dc892ea311e760f1f5d9f6ef54a055c8f965e1bb5e19150e42
pdf-font-stream PDF embedded font (sfnt) at offset 0x15309 18120 bytes