Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b43435f3150f2c6…

MALICIOUS

PDF

89.6 KB Created: 2021-07-21 18:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3550a0de16d9aedc7613352f8af48616 SHA-1: 8e8640e947568fce2560d1ebb751838a283ff93c SHA-256: 5b43435f3150f2c674aec81a714450f5568d44788f9aaf5c20fb147dd79797f2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. The embedded JavaScript is likely used to facilitate redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d61b0b31abd---4435134937.pdf In PDF document text
    • http://work4shop.cz/userfiles/file/40281350155.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/54958557379.pdfIn PDF document text
    • http://esistore.de/userfiles/file/bozazusavirow.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/wunivegafopepowusarata.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/0khqltpta081kflpcjq12it52r/sajiju.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965da6a0532---14844337977.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/bubizinibejojeb.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/90763907302.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/kepodawaxomozitolekas.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/dobotivuwagututatebet.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160961f135aafc---81672514358.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/rupujazawewumaxadugiboji.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ca480e47f---nobulejulabumetu.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5f9277fa3---zevaritogu.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/d29b8538833121ffbcf131d1bb1e0a04/55733971204.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16099e14a134dc---60025372839.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a1da13f60---43620147319.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/72456051517.pdfIn PDF document text
    • http://guchenes.com/d/files/63914263659.pdfIn PDF document text
    • http://eastbrunswickliving.com/clients/77672/File/damozuwaxofofavezisude.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ad13d916cd2---39228185939.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/367649193.pdfIn PDF document text
    • http://valaptop.com/ImagesVA/file/20571318891.pdfIn PDF document text
    • https://ms02bet.net/contents//files/16138595713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=read+the+help+online+free+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_off0000fb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB88 10472 bytes
SHA-256: c687098cc9a5a07c858a10512f6664e89ab2d30926d2ea62481e9c7fa814d2f0
font_01_sfnt_off0001132c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3E 17568 bytes
SHA-256: 18e62c9b858f1b6436119a27bfbc6bb8cd1aaf5369b087cf712357c3b9ca95a3

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