Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f413c720eb28e1…

MALICIOUS

PDF

84.6 KB Created: 2021-07-17 00:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8da218c0c764f421f4e8325554895fa3 SHA-1: 762f74180daec3d56d1117c453248fd8fcee648c SHA-256: e7f413c720eb28e16d986e39772bdba89566da5bb938c9b443b104a9afd96d99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm hosted on compromised WordPress upload storage, pointing to other PDF files. The presence of multiple links on disposable hosting and the use of UTM parameters suggest a phishing or scam attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948e824788e---87070830440.pdf In PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/78185438323.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/kabeminatubudavi.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/sorexazomalovosas.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/hjkjtfpnvfmh3fheudtgt2dqm4/dukejigoravitetasuw.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c21707586---29367527177.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/35378528286.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dbb5e942f---11162295949.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/21958907827.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/labedebufokepajotagule.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8597bf0f4e---39656471755.pdfIn PDF document text
    • http://stattus.com/assets/file/21164866942.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/loluxutoluso.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8eaf0769ce30b5a810c85882d1aac0a0/zonunixisazapesod.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4370625679---44238269460.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/zonor.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160af8a1ccc5dd---78521335489.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a97f1908410---dasogafunipoloririzovage.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/2274082286.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/7fg7v6n930fj8ltc8l2n30f7b0/befuvixejisagulivir.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/0873765232e92941eb1b178e70357a54/42777773986.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/86cc26df3fe5e8ad7cb0ea875e385ddc/tuzaxelepeb.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/nj5ql4bmnh80bff5ivlf5ovft7/jijaperunipuruk.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/06i2d99vuge00h2icl3vega5cl/kanemirazetumobarofavaref.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/77558011745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+sims+2+ds+romPDF 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_off0000e807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE807 17056 bytes
SHA-256: db5f2cc04337e539b142c793e9fa73ea09a2f20f32012bd9bef6e739a94910d1
font_01_sfnt_off000114d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CED 10188 bytes
SHA-256: de980feb0a2ab07fd7bb46b2da986f964fb5430a8c94ea2e871b6a9e3e957623