Malicious PDF — malware analysis report

Static analysis result for SHA-256 160882252ed488f9…

MALICIOUS

PDF

86.4 KB Created: 2021-08-12 07:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b71fc4778cb65f8b195d27cd329aca17 SHA-1: 57b928f4f9b058f4256b31167d311b2474075645 SHA-256: 160882252ed488f90c4fd65caa31eebcf9fcc0ea540e95481ca9a6fd2cdb9646
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest it is designed to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://queure.ru/uplcv?utm_term=trollface+games+unblocked PDF link annotation
    • http://www.casasemio.com.br/ckfinder/userfiles/files/fanoperagirojekawizi.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/96380352652.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/qcoq3paer0sfbebl3evqku3ver/vujoxosugadunajo.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bff52d08b---33294242778.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/6dfcc853d28202e630d6d720e2136999/13419288055.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b35430e5d19---pijivefegubube.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/mtc7c2tjr1gtobiu3giameabe2/pupegabiwezadupe.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55981a97b4---narapadofefobunevewet.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/63496903741.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/53pkd17ctcdt1vkp2lg32fdvo1/fefusumumojotetotosam.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/7l4aev5ks1862s010snksepk53/lezawazanazepolo.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/zukorasatowagezogisefexi.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/99484770697.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/dogimedusobilupujov.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/7a10b594e6a8af29ccdef55317dc381c/taladus.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/121u672fq954k4prd7kut1tl07/29420323862.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097717e1e398---36117806542.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/nd1lthloec7gr80cd50g59dhb1/negorobokovewizasuzo.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/1mu936opkqgomnte2m13ah8k00/69705781414.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/xexusezuguza.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/tepojetawij.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/37219731751.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/b46ad8af7e06db1413b4aab6ac098977/9689861041.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_off0000e820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE820 10924 bytes
SHA-256: af8002eb0ab2c4d5cdf447d525819274927946639f11ed6721171190ab4c1a10
font_01_sfnt_off00010143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10143 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11955 19160 bytes
SHA-256: 83d476f7f6acf2cf6345543e7a7e53535c67fbf3fea21f6f5034995b9cb7a96e

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