Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b905720cf22a34…

MALICIOUS

PDF

98.2 KB Created: 2021-08-20 11:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cf7159fce382b4edf1ca0d0c9907fc5f SHA-1: 2fae73b8bed83a20e27727e058338829057d2177 SHA-256: a2b905720cf22a34f12ada4bd6c00c932129c04ba42505fd4c1a88702a97b2b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection as a phishing trojan. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://dui-antidote.com/images/userfiles/file/76760302149.pdf In PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089096a89b15---21600713943.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/34105986210.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/latinidemigomoxidoxi.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/29366919155.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/9l5mt9jh394bs5c1o3eo16prs1/buwadiraxoxonanun.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/kipigeto.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4cdeb7ad1---ropagatediloba.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/aa2a4f9c188aa17f305f98af63436728/vebovikuzunepumo.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5876cbb47---fijalokobafaxag.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/2420544d4b4e409517ae38aff07cca50/gofelukokasi.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/39359196037.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/60167162826.pdfIn PDF document text
    • http://cpils.com/userfiles/file/12818618966.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/lepofabojeloxebedabile.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/64bf52341aba8d1c1b69b53f0673e844/naxaluvogubipoz.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/5ujr0qs6efo7s59qi6epnt0e13/69848684979.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d9eca5382f4378328f2b7f00269e6a5d/pataduginujijunoguwifivak.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/davixifezurusiwasigo.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/zekaxuze.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e0977bfe374fd506f4af64588d90edef/58955228578.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/juwofemirawoguxol.pdfIn PDF document text
    • http://aimic.com/userfiles/file/bakulavosefidoj.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/duxafoxekekasojazoraju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=sikshashree+scholarship+form+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB9 17460 bytes
SHA-256: 602e09b1426f26654d65935e105048ca07338b94fbcc6fac3464492ecdc7f770
font_01_sfnt_off00014932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14932 10848 bytes
SHA-256: fd9231ecc93e1aea29f5ff11b6c7122b8a8a1d0de8cce68f5c253e00f56edaa4
font_02_sfnt_off0001622e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1622E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1