Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b85026b37fe59d…

MALICIOUS

PDF

80.3 KB Created: 2021-09-04 10:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d5c0ba4b4317e9baf692cd7626641ec SHA-1: b094c1ec5ba8635eb5674fe7b80fc53836f26eb5 SHA-256: 56b85026b37fe59d8c46192a4fcecc7fefe7f55a9fd2b832e847f639e48a596f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous external URLs, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or scam objective, likely leading to the download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=how+to+convert+pdf+to+word+in+foxit+phantom PDF link annotation
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d91ae4815b---kanokopuwolibugov.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/95145662375.pdfIn PDF document text
    • http://rapet.hu/files/tozowipuwixivaxofosonipen.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161271d3ecf194---poketakotowixetorakex.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/94074291624.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/afd05193f72c0bebc8f5a68cf04b72fa/zolagaluk.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f501c6b07---sosusunonavivuwimarep.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/fomabaladejusivexa.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/29310916508.pdfIn PDF document text
    • http://congtyvima.com/images/Download/mesubokabisoxenevozoj.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/2b69bda91bcd988d91f78b376fa16a5d/80170630634.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/wimek.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/foduve.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/679ab5c4f8aa1e7e1a22ab6e61705abe/26555335147.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b2eceadd6---fikower.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/18ce5416cb27740b21e039f57c0ff184/47372574678.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/tcpk6pfug8an3mthlgm512vr26/mukiwetumenujax.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/vitovepetinavebo.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/5f298369f7d9af09cd69b12bfcf6c87d/rovunixobedobukoriwara.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/3029249730.pdfIn PDF document text
    • http://yukamifashion.com/upload/files/81490658173.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/nanigubewuf.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fisujup.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721d4faae80---nenofubaxurumubo.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/rubukufevumes.pdfIn PDF document text
    • 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_off0000d51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51F 10916 bytes
SHA-256: 784af6c3e3cc03bb6d8fcf9e21580d8fd1756e27464833065b60768ad6850710
font_01_sfnt_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001064c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064C 17296 bytes
SHA-256: facae2afcfc13e7c35c73222d39935e74f98b6890367055abd590cacb9dc8efa

Open this report in the interactive analyzer, or submit your own file for analysis.