Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e504f53f29f0fca…

MALICIOUS

PDF

84.7 KB Created: 2021-09-06 10:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 032b1c1a577d494dc197db4a0da428ea SHA-1: 490f3950472df34871dcb928a400f071fdfc562e SHA-256: 6e504f53f29f0fcab2da4ad2042c0c1884c881e8b7b53e433260954e90fa2ea8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088d4ccd0142---nomowetulurukaxina.pdf In PDF document text
    • http://weiddy.com/uploads/files/202108282332407341.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/95404826148.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/od262lru7gh7pa9vjc28sfru10/nodetititamoxudumeku.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/36251055380.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5beb35a551---kebujozoxelibipa.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982495b31e9---78490737215.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/m9t33k9ujathdhbutq4gqbq5kv/bodovibiwunoguruna.pdfIn PDF document text
    • https://ebooksweb.net/files/file/lamozis.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/niranadanomitetedabom.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/danumufapuw.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b672a29d2---wogemafofazijonofos.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160e4f50838f78---41786795701.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1db9f2855---83038898346.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/52357209784.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/74241786022.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7d46d24ac9---mefikabamagusotix.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160eca127cef97---kowewagudijuni.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/4d3b27d3f77fb46dc80b9458be668601/vokigupu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16125d6d45fc75---nuwixinuwu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/vamizi.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfc4d558ea---5597074326.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/58426348069.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/93201175915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+wuggly+ump+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_off0000e2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB6 19932 bytes
SHA-256: 4ea316c19ca24291033ac63852919f8f93f0b486de2f9e8c9f0ab03c6faaa217
font_02_sfnt_off00012e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4C 10364 bytes
SHA-256: 2fbdcf60ed828cb301da0be263eaea5d6151da365f90dbde1accfab79383f0d2

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