Malicious PDF — malware analysis report

Static analysis result for SHA-256 285213c991c6de45…

MALICIOUS

PDF

99.8 KB Created: 2021-07-09 16:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6a6c6415bc01d5cebba025caa1138a75 SHA-1: b7c289c9bc1e8bfe38b42bfd3a2479626b99f93e SHA-256: 285213c991c6de456bce0ece2fad7784f25cde7fcc04eaeec451d2af1cebaf71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating it is a link farm hosted on compromised WordPress sites, with a high ML classifier score and ClamAV detection confirming maliciousness. The embedded URLs likely lead to the download of further malicious content, a common tactic for phishing or malware distribution. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c544d3bd6---dinonidukenomoputu.pdf In PDF document text
    • http://dianacb.cz/userfiles/file/85555667612.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/51295734225.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/zewavodulafugudato.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/d994064c0593222adc2dcabd2f37867e/65201376665.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/40625516854.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/zoxopozisirevuzewumul.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/novivizudugupilepis.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/4537473e5da915cdf67461ec94fa029a/sudadozebiwaz.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95b7cec1cd---subokipasozokugo.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/fadorap.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/97ca6b74b91fa0f39de9294eb435a252/52704934874.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/livadusesorifirenoj.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/50442996487.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/c9e6596ba7bd9de79179486d02804e72/57837758012.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/u40b992avmtus54nj127sklj42/sazepoza.pdfIn PDF document text
    • https://pellevah.com/upload/files/mivamesibosav.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b0bee8387afe1cdfb7ff36f63aa5b4cb/wolazozax.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075e32ed2005---9100142995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=from+the+grave+kresley+cole+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10862 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12074 19012 bytes
SHA-256: 3dd09420092509c0a2f82ab713b8a6ec5fe572331e4056d4ce46968b4fd176bf
font_02_sfnt_off000151ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151EA 16244 bytes
SHA-256: b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647
font_03_sfnt_off000167d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167D7 11120 bytes
SHA-256: eab6ebc2c658c8f6fc369f7f45016114dfa05febcaa56df03f5b696e87f9391f

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