Malicious PDF — malware analysis report

Static analysis result for SHA-256 353285f0fdef499a…

MALICIOUS

PDF

83.8 KB Created: 2021-09-18 21:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e057b9d3ba96d0bcf9adbf06a08f6bbc SHA-1: e52d2cad5c52ad94aef3d7aa30efb2070c99d6b7 SHA-256: 353285f0fdef499a8161da54a37c1bcaeb818c3725ccccab052c73c59cf9e07c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous external URIs pointing to potentially compromised websites. The document body is heavily obfuscated, but the presence of external links suggests it is designed to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://laborke.ru/uplcv?utm_term=kim+kardashian+selfie+book+pdf+download+free PDF link annotation
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/62f7c42c57fe5160269c499f6e5a47cb/wopebelipesajilo.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613520faeb90b---22940608770.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/78594833216.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/35455460944.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/23163479642.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/48908809311.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/mudidakosi.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/zaferaxefuja.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/falawisukisetivunu.pdfIn PDF document text
    • http://synphabase.ch/upload/file/ravulafedirezusupujovir.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/sebujafivineporigenaxe.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210919001155_bnV2YWpv.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/fiwesowolerotevebul.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/1789762306.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/19152251426.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/jixuze.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/guniji.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/0932fcb70d1c12457b757ab071e454f4/jezel.pdfIn PDF document text
    • http://hijoin.hu/editor_up/binavijajukagofujixamix.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/jegumovila.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/pitolejilorem.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/93508037670.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/47809697745.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/60368605007.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/87146222075.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/rurijifuwumafesabav.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_off0000dd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD30 10972 bytes
SHA-256: 14239ce1e97bbfaf966965740ee1f6e2972c038ede03c94ce6641943901a6e99
font_01_sfnt_off0000f62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3E 19428 bytes
SHA-256: 372de47d07e2e818d5ca71dd5f613159569c8c7d8caa1d5991ae8f86bc1fd0b0