Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc895cd85e9b26c9…

MALICIOUS

PDF

80.2 KB Created: 2021-08-09 09:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c78941c3c753fc2d76cd9fc6020ff394 SHA-1: 0754795deb0636aeae727e351867fdc293ef2f48 SHA-256: dc895cd85e9b26c948467249895795bb0217660001804037f0dcfbbcc7dd8b6c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also features a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute further malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d6774be8---vidoponatujuxotenolifit.pdf In PDF document text
    • https://leganordavigliana.it/uploads/file/78593195857.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1e1483cf9---xusirijadotasironebutin.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/89270513999.pdfIn PDF document text
    • http://amandamaitland.com/images/file/30834505308.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/a8521306810085d5598cacea04850e23/53685571813.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/8d3089dc688c8297d24631ab9e42d5ad/32967400472.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/kapebumabamiwepopof.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/880e2d92494e470c9f9e9d771cc1792e/61159642635.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/1de45d6ccda0b243eb0c9b97c007abdb/mikotajosaxa.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8aeddi64efo6rbc18sj3j82g50/lewelij.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/dazafuduravinukoguf.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076b80530a1c---ropurokufagemunejub.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/68632471125.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/64712305026.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb7489717d---tojuvoro.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/33377328624.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b447c684678---soxarekuzid.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/kilupevo.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/4390675142.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/dixuwunatinazanamuv.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/15453212677.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/rabinukizazazofokuguzop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=love+is+an+open+door+lyrics+broadwayPDF 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_off0000d539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD539 10772 bytes
SHA-256: f0bb3ff2155fa453d228e69bf8b0da0d8df7a5ef224060438dfcd73da7eb749f
font_01_sfnt_off0000edf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 17020 bytes
SHA-256: 9044a5c7ec5a6d7a1a417602c3fe6ed5b5797a8160c465a3540247a17a7777e2
font_02_sfnt_off00011aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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