Malicious PDF — malware analysis report

Static analysis result for SHA-256 86dfa9b5a61f2c44…

MALICIOUS

PDF

80.0 KB Created: 2021-09-11 23:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cd3a7f5834cb163a3367159b0b541e4e SHA-1: e7adacfed327801d37df88bb96c82f4910fbd74d SHA-256: 86dfa9b5a61f2c4419a72383940c92b3996a7d085476d2d59756736a387a0511
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 exploiting PDF viewers or redirecting users. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://silverstonedevelopments.com/ckfinder/userfiles/files/90965276519.pdf In PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/cphq24umemjb2gqrc35n8bgdjs/85675882298.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/lesiwuwibumekojizavegaxa.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/35407595719.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/nenijamutenoba.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/vituzul.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/xekuku.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210907_073142.pdfIn PDF document text
    • http://szcftz.com/upload/kapif.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613197a1f1dfa---31820923626.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/23224263375.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/49033903382.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/88377365526.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8981c408a---25078519441.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/tutekorew.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/toror.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/86686574906.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/16310881261.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/resatuzu.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/76830830313.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/99516003938.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/saxibek.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/79774222312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=central+idea+of+the+poem+once+upon+a+timePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B8 17464 bytes
SHA-256: 1230adc99ed06f2d12e3a3bfbe9b5b01030713ae5621652b7d5dc25d310798cf
font_02_sfnt_off0000ed1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1E 17076 bytes
SHA-256: 4166f52fb3095abc08fa456740a862288424ca518c53b0bcafc89de46322cdfc
font_03_sfnt_off00011926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11926 10848 bytes
SHA-256: eeb1f6469d6a7b73297f01044cbe9cbf46ed7d6b00d388fd73e263842d2eef3e

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