Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f7f80a09b1bd4f…

MALICIOUS

PDF

96.3 KB Created: 2021-09-02 11:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 474167c2f7aabc1629522274b2517baf SHA-1: 86da12171c6193ce12ba49d6a473fa4cc324e6db SHA-256: 70f7f80a09b1bd4fcc76d28645db12c47faeded03b49b5136dbf7fbc81cd01bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's used to distribute further malicious content or phish users. The embedded URLs are likely part of this distribution or phishing scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 6

  • 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.
  • 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://tienhasteel.com/app/webroot/upload/files/derapi.pdf In PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13ed5cf35b---muzalamajatim.pdfIn PDF document text
    • http://giaphutelecom.com/tctt/sites/aaa/file/bafikuku.pdfIn PDF document text
    • http://artdental.hu/editor_up/7176585432.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/mibesobafofam.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7b402e37c---59539428342.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e3b2e0d016f0c909936295a739e8a4e7/49998158200.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/34537204718.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a598c083d---5424210818.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccbe9cd23d---sebuxiturumitiwemaluzob.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/28022c131b9fb9b23f578cbf93c3ed6e/livure.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5a6446fe1---24767136729.pdfIn PDF document text
    • http://klefmarken.se/upload/file/66818492689.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095ca1762c0b---28708089152.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/pevubibixagoxemobeju.pdfIn PDF document text
    • http://alltechsro.cz/files/59763278771.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/12fa1njuvaocq9fndpnn8h678n/80646549612.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/mafovimudafopus.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/xekagawuxomodewawo.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210717_C360962A7837EC30.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb83666cb7---35051914895.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/adc07e3be2b764208f5f3458a3dd9eae/76739885737.pdfIn PDF document text
    • http://gardatrans.com/content/Files/danodunugolonulat.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/34302569712.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/bolitudogitipikuxixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=%D8%AA%D8%AD%D9%85%D9%8A%D9%84+%D9%83%D8%AA%D8%A8+%D8%B9%D9%84%D9%85%D9%8A%D8%A9+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000129ae.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x129AE 28844 bytes
SHA-256: e90f609461f2838aed729d638f8c2eaf38f04e9df147fa48c50627fa74c14240
font_00_sfnt_off0000d721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD721 21012 bytes
SHA-256: 656172b5e7a3124ca4ae48b2a8aea13aed4104ae98d88515eddacf1ecdc043f3
font_01_sfnt_off00010d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D25 18096 bytes
SHA-256: d07ecdeab16eb99f89fe745ee22cc346023e76e8d81fbec850b72ad2605e8661
font_03_sfnt_off00015d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D14 9372 bytes
SHA-256: ab692011bb810b4091e5b6863c1468cc19624005727076e0e42723678ec61724

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