Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ce5eef49f7045bd…

MALICIOUS

PDF

76.7 KB Created: 2021-09-08 00:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 35ffe5e6d7477bd331ee24017bdca728 SHA-1: 91f78a05f59c5fe4f4c23cfd1e742dd22255cef8 SHA-256: 0ce5eef49f7045bda312ba058b291fa96b31accf5ef7ae27dc1c0d294f9d4e14
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations used for hosting PDF files. This suggests the document is part of a link farm or SEO poisoning campaign, potentially leading users to malicious sites or further payloads. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=flip+flop+logic+gate+pdf PDF link annotation
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/37186c02e643c31e758a0e4c19a3744e/77938798372.pdfIn PDF document text
    • http://allycatering.com/userfiles/punevunijinipulatufoxo.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7cee347ee---70457252751.pdfIn PDF document text
    • https://x-software.cz/data/file/xepuwa.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160916f822487a---59412235016.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/9utk7702j1d3k0nglm0lhft4e7/kewuzorutuzujoxim.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/xoxiwagokuvovagiw.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/wajiduviboziruwun.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/gnp6djsar2p88f8ei5q2dks0e3/7755315750.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/sokutawunuruzebe.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/86423874916.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/29922973332.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716f7833ec6---88245860429.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4bb267e80---12919246371.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ffbee01a1db4ca45a417eaf78a9e7d72/vofugeso.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/2944617300.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/jjf95tbugjj0mo029qeugss5o4/nujabesi.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/97130821883.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/niwazejifisupiruxezaz.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609544acc63d5---zolexafarufedixotuwatodem.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087550eaef80---63087224988.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/tapobewafafugifowunegif.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/78571288287.pdfIn PDF document text
    • 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_off0000c809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC809 18024 bytes
SHA-256: efd0b9124b238166c7ffe306a26de9fba774d68a0b49189950e91ce8863b7ba8
font_01_sfnt_off0000f638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 10400 bytes
SHA-256: 8acd9d2effb1aa98deddc281df37a913a2beb56fc85aff7c257c4347bc37c8cd
font_02_sfnt_off00010da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1