Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2b2b3f978f0958…

MALICIOUS

PDF

96.6 KB Created: 2021-06-30 23:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 74fbedbe1366bf4aa32d22987c8b705c SHA-1: 0a25cbe5eefa99f1914a366ebe1e47012deecdd3 SHA-256: cd2b2b3f978f095836be6748bcd85abf2823f27320320822bf25a599945f8be6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised or disposable domains, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic firings and numerous URLs are sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://kotolantopeni.cz/file/86297682231.pdf In PDF document text
    • http://magicdiscoradio.hu/userfiles/file/bozaziwevuxu.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/64768939139.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/92911749765.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/2213ee33be937906fb83f6bb9d06625b/rozopulozofigof.pdfIn PDF document text
    • https://belloverde.net/emailer/file/pavotoxufebuxunazodixu.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076262677e16---38391643569.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/4309760460.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/e77b89436a804bff9b0b7c8ad70ab6d1/pesapumosukenekize.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c435f15bfee---vipidudapizas.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e8c93ae4e---moxefedamorexowoxe.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f953f0706---64520644590.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098b05ca5212---59833966539.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/7b5ec75f04bc99836d5e4a69aaae2c2e/96346555292.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/2fq9obaborc0vs05hrh7jgskj8/mobinulebalesamuw.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/c0f448a59f689682c830ab6e56011f2f/72332912189.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/futapavoxikuted.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/zarigupexitefopupibi.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608832f0ca4c6---48731903120.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/464edb00ln8if5nm0v115caprb/xorigone.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e8c48ca85773a3f7b2351e8ac997a618/77568378567.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/25278970119.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/h1p543hq9tbmllrh5kr7unu6lv/99230221323.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b80f6ec030---25672095294.pdfIn PDF document text
    • http://93564497.com/userfiles/xitivekulisidorubodotiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=wwi+study+guide+answersPDF 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_off000116f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F2 17540 bytes
SHA-256: 4ff8ac959b6288e60beee32ffeb4672ddccb0e7363691f39f057d8ebee00ba81
font_01_sfnt_off000144cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CE6 10548 bytes
SHA-256: 05841f78e317c76daae6563909894ff3cd4b153eaedad4c95071de95a209b1ec

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