Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e9bf706bb199ff2…

MALICIOUS

PDF

87.5 KB Created: 2021-09-14 11:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dd6b75291ff04e321fba70e12763dc64 SHA-1: a1135634394b6da2de34cf6ad1923267ed87b76b SHA-256: 0e9bf706bb199ff2f8ae395463373c0d0b7bda2ea362c97e7656c2323be951e1
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised websites, likely intended to redirect users to download malicious APKs. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs, many hosted on compromised CMS platforms, supports this assessment. No scripts were extracted, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://e-uchebnici.com/img/file/57173139463.pdf In PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/selidavona.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/akkl8u9qmm7jqa8aioitdrten5/98507231143.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/9c1c00a9551832585bb8eef4cdba02ff/liduxagererix.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7518c7793---rixaxolotanibakiripafiza.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/83269574661.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/zopedix.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/begazavekimiwuxen.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/43535755582.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/vumitepivelupunoxulinap.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109090427414007.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392156decfa---gefomawusuwajodi.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/lowekisirorebigogegel.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/xiwelutimibuj.pdfIn PDF document text
    • https://izr.fr/files/34730449645.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/lawegerubunapupu.pdfIn PDF document text
    • http://zerosquareonline.com/file/23639728494.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/b4a5ac94a1781ea579208a284c574ba6/35035051989.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/ec7f73cab8eb03010fa1230e45dbc4dc/mobekurugodasu.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/rp9cucsn8mlqka2gumlp6cnt4c/34093531085.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/2150253479.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/genofeledomiwu.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/mojugedu.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/rarowizuduradazed.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613aea495ebcf---6101456544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=fpse+apk+download+for+androidPDF link annotation
    • 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_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 10548 bytes
SHA-256: bf39627102f531ef657eb350a02d60e2c50a30a4eb24438b845fdbef723a6ff1
font_01_sfnt_off00010a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001223a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223A 17476 bytes
SHA-256: 6b1d23e75780edab30e5a656e4cdee5807680c3594c43091f13903c596620d4b