Malicious PDF — malware analysis report

Static analysis result for SHA-256 755e632ee340a467…

MALICIOUS

PDF

86.2 KB Created: 2021-09-06 17:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b17695d748f53108d70d4321baa7e6b8 SHA-1: 4a41aede2c46279810ac8034893a37d122e68ae9 SHA-256: 755e632ee340a46709a05293f4bc322a7c684716a9abf303314a3cd44a58a08a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, likely to redirect users to malicious content. The presence of external URIs and the nature of the detected heuristics strongly suggest an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/0a684b790b4ceb914ba57c9b43446311/febunuwitogonev.pdf In PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/lewikagimim.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/68930434764.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/48972331462.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/8o51ljqb6n5c5plp8d3s1b5n5t/vutiposozawusewadosaxu.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/2fa164be2bfb2ed89ea95e21c7af6fec/xuzaxoz.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/830f1135194d18c38e446af37fc0a5b5/80892238643.pdfIn PDF document text
    • https://led7.ru/file/81254206207.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210613_050549.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/5207c5cdbf452b3157368dee991b6a05/jujiluf.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/gororupor.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/mupufoworozudasumaj.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/63521047664.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/egcfh7ucomlhd3sblqh09vjtv4/tozaxebirujoxi.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/e520ec8fac3e64e387430ff9ea1d422a/86353303960.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/5187fba41d62cbf213e53968ccf421dd/vaxufejazotumu.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/jotawafadelutojaxewoboliv.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7459aa6b61---bomerezax.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/buzal.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/98649967800.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe9d33f08b---matokipojud.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/71119443906.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/maravikapofuvezanixa.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59701756b8---57122415226.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/gozoko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=waxes+in+dentistry+pdfPDF 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_off0000ebcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E1 18408 bytes
SHA-256: d515bd1b22dae5b25b1472ce0785dfbd7d6d9771c20f27ac61389458ec018c2d
font_02_sfnt_off0001331d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331D 10532 bytes
SHA-256: 7853aa0376af723123f400d3bada72d003a5304b09cdaf7aff8367efd9d7f005