Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c5ed486c14e9cc…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 13:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 39ebccc2aeb1dbc682b055e7b335eb0b SHA-1: c9ac0493fbd35a3f995f086b7196cd866101b1ba SHA-256: e7c5ed486c14e9cc1145bb26f2c7b2ea55a01e8736404eaab6c3d3da7d9dcac7
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites acting as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure the true destination by using many distinct hosts with a single link each. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common method for exploiting PDF vulnerabilities or initiating downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://irlanc.ru/uplcv?utm_term=xiaomi+redmi+note+9+pro+price+in+china PDF link annotation
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140cad3815b5---nakowagopoporiw.pdfIn PDF document text
    • http://gdgom.com/upload/file/2109100159400920582rwu9i4kgcum.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/xixemofojebus.pdfIn PDF document text
    • http://prota.ru/upload/files/nosamelurirotit.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/68026160143.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/91280186112.pdfIn PDF document text
    • https://curvy.tw/upload/files/gekonenifilumojuganura.pdfIn PDF document text
    • http://flomojapan.com/upload/files/49820444541.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/rupesekawula.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/tutovelumefusugosekiki.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/pinitimedizemux.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/wetomawixade.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210909_181009.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/lororijodiwefaxasaxa.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/petobani.pdfIn PDF document text
    • http://labotinnghia.com/img/files/vefikuxa.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/96954413240.pdfIn PDF document text
    • http://annabarons.com/files/files/muxibibobujewaxawitako.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/vewivevedib.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfc779ccf5---bopupoto.pdfIn PDF document text
    • http://p-energo.ru/content/file/gukubodebo.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a79843711---faluloma.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/givejowejinazanojowinin.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_off0000db11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 18124 bytes
SHA-256: 23e2cddb82dc49162a120b646adbb248e9b5eb6d73ade71b6a58b3236ac5c0e6
font_02_sfnt_off00012256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12256 10740 bytes
SHA-256: 6ba29a6b7975ae4ede54097a3ebb7dbd9678ab3afb737abf80971a18d60e1b7b

Open this report in the interactive analyzer, or submit your own file for analysis.