Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf12834a19ae471…

MALICIOUS

PDF

107.7 KB Created: 2021-09-11 02:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9e88bcc8c33943750574d5396bc9a547 SHA-1: 3156eaa86a882e37c6455b484ec4e082ed794c6d SHA-256: 5bf12834a19ae471273436e22d9d8c9e4965cbba094bd2d7bf7aa74751304e49
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites or disposable hosting. The presence of these links suggests an intent to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://pistant.ru/uplcv?utm_term=iphone+emulator+android+studio PDF link annotation
    • http://ediljolli.com/userfiles/files/nejajoxapipujur.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161385612c98d3---luligikaxinojojededakuja.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/35326681802.pdfIn PDF document text
    • http://jarosi.hu/files/file/xekumozuxo.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/binid.pdfIn PDF document text
    • http://szpk.hu/_user/file/46962204041.pdfIn PDF document text
    • http://kleiberit.ru/files/file/43470901874.pdfIn PDF document text
    • http://kodemari.info/data/files/20633170433.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/62580294421.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372c596ff59---pinafuranitaxaxegusala.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/bogivukalikuwovakakewumi.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/57352366596.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/fe7878b7a720715f71625966be522b7f/26191725290.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/xosodebidokerinuguso.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/wufobu.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/688bbitit0kqujjc39v6flmikl/terutijonegokudizujonom.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/79cf08618f420c3f23dca0a7e5439fff/29211532782.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/mesunavumawobazup.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109080348558956.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/nimewukubovotatugaxak.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16133d21eef181---9740786502.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/rovasosuvipefatudiket.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/84446788937.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/vozek.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/27162510255.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_off00013ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCD 10708 bytes
SHA-256: a0eec4b004e9b05611f956938920fe5024f7f82517770eb2defdf516bfe65bff
font_01_sfnt_off0001551f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1551F 19992 bytes
SHA-256: ac24756ebe4eac9ccb4213183921b00155180c03ed1cd19eb57d06d3277a7a28
font_02_sfnt_off000188af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1