Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1bebdafaabd5a16…

MALICIOUS

PDF

83.4 KB Created: 2021-08-20 02:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d20bdd0ffd507c7673f7257a635b62d SHA-1: 315d254f429f81de3b8a4c8ba91b4b237129923d SHA-256: d1bebdafaabd5a1603d96088a0e7522eb4616e06acda8ad6a5c498f800da745c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. Heuristics indicate it functions as a link farm, directing users to compromised WordPress sites and other disposable hosting, likely to distribute further malware or conduct phishing. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e652ddd5eb0fff0d89f21904f4750f32/nipasutegemufajesedobunu.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/hv21bbvad8clt8frbfg56m2tt3/34476560633.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/49842588503.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1611aa7ba4e641---nofupoxedusinev.pdf
    • http://dztechfin.com/upload/file///29710242321.pdf
    • https://equantumconsulting.com/files/files/zaludalikusiruxa.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d0879fd55f937c562f2387ab8f21727/13702352942.pdf
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/fibezewigu.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55b11c0aeb---dikosatugizozegumajedil.pdf
    • http://emrc.ie/upload/imagecontent/file/82785843130.pdf
    • http://giovanninociti.com/userfiles/files/50728751128.pdf
    • https://wolfgang-photography.com/userfiles/files/27097362412.pdf
    • http://marblobathware.com/app/webroot/img/files/xukapo.pdf
    • http://albarossa.jp/js/upload/files/bajazatulolebunu.pdf
    • http://vanxuantravel.com/upload/files/fawamijod.pdf
    • http://blpest.com/UserFiles/file/77646431417.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a9313469b---zibobejivasolabuzebo.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bce8d999afb---tijenej.pdf
    • http://gocep.org/data/userfiles/files/rawugugis.pdf
    • http://recko.ru/ckfinder/userfiles/files/wowigevoxog.pdf
    • https://xn--b8qxb801j.tw/upload/files/60311811888.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aadf1ee5843---pobebun.pdf
    • https://taevlingar.se/images/pages/file/55357419305.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/xiwiseluzexoja.pdf
    • http://wasserentkalkung.at/ckfinder/userfiles/files/veburomekowime.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/093dce06e8f34f4b1ced9ddbe62dfe27/26471011938.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=msp+hack+2020
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e42a.bin
c91adabd0ea26ba65c219cb1fc7cad52beeb9c7835dbef83e3f2a316f7dae6ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xE42A 16960 bytes
font_01_sfnt_off00010fce.bin
222fd252b6a9ba67eff146f4564c9ecb8c9a265c78b869ce593e6662608e72d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCE 10104 bytes
font_02_sfnt_off00012690.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12690 16792 bytes