Malicious PDF — malware analysis report

Static analysis result for SHA-256 04e3d8102569dacb…

MALICIOUS

PDF

74.9 KB Created: 2021-06-24 10:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: cc94e393bf1e241fd132d0b7553af90e SHA-1: a30af547f49661dbb026da5534000aa1eb57b372 SHA-256: 04e3d8102569dacbc71ebd4932cabec16ceca60f17e067aa63c279371150a52f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier strongly indicates this PDF is malicious. It contains a link farm pointing to multiple compromised WordPress sites, suggesting it's designed to redirect users to malicious content or phishing pages. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a49c5b157e1---borulaneborijutoteru.pdf In PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/e3e544ed3bb1611acb42c0a0c11991b4/wosogik.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/ditematisodunas.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/6fda6a2a0ee5fab080fc9a9f86e14d13/33291896859.pdfIn PDF document text
    • http://mwflower.com/upimagesfile/%5C/29020952542.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/d3123121489bcda490eeab6e3ebf66a1/19871757885.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/kipufawutegem.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/0fd6a2c6a9320e707dc176b38cd30bc1/26843539715.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6c7b2dce41626d7be4f7c4249a9fb36b/wemevikopekadomuvewim.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/vmg1p0pe4legsbdum25tsb4l64/62720393921.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/fufipaliraxakisosa.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/77301118221.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/jadez.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/sh5ep0fr0rimst63338230qg01/mupubumiz.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/kisodid.pdfIn PDF document text
    • http://dejede.com/userfiles/file/kilegoxasawi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=example+of+input+and+outputPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E0 4936 bytes
SHA-256: 044ecbea1af49c6593f34826446f24927fea3fe0cf214edd8f342716cbf95d86
font_01_sfnt_off0000faa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA9 10748 bytes
SHA-256: ad433923dc5b7213ec0d62ee31456c8dbf28b07a00ad59639ce797ea12a7c932

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