Malicious PDF — malware analysis report

Static analysis result for SHA-256 907bcaec89bc3f62…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 10:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f460c13a01d634439ff8bc6bccce94f9 SHA-1: 70d8ef06b25e3f9129179c33c30bd3b3105e5d39 SHA-256: 907bcaec89bc3f62c99acb73999bbc9b5d96b2e644cff0a1a8cdb21de05358ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution campaign. The PDF's structure and embedded links indicate it's designed to redirect users to malicious content, likely exploiting the 'Spearphishing Attachment' technique. No scripts were extracted, but the overall pattern suggests a lure to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=new+york+state+earth+science+reference+table PDF link annotation
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d33374d44---63786273218.pdfIn PDF document text
    • http://dges.in/userfiles/file/janini.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/8aaf3d4f79ac104490fdfdf14f26494d/nadubitinat.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/5c309u42j3kgirb42kjntcq6u4/62636789693.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe86d341d---zevorupuf.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16117f46d1aeec---mubajamesatezivu.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/74459410490.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b8f6d07478---xefevaxaxusabuluv.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b90d516c8bf---47975663124.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd9324a8b4---jevawowa.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210809225543.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/13513102119.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/domin.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/49174270673.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/45417098329.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b00c8c5420b---67774566062.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/totatolo.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/79efa630f3e22433f8d26837ce52351e/97374482126.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161125f3007aa6---49755479807.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/22605943999.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160c482b2f2651---lujatetuzibu.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609249b8ca5c1---weronus.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/tituzijofutalimotijujavij.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_off0000dedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDD 10840 bytes
SHA-256: e241c4f1b66a20c8b5f439705b51501c4df584fefd23d4c11b51b667a9c8a719
font_01_sfnt_off0000f7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F4 18404 bytes
SHA-256: d85503f550110de0be7515d7b610bfe2cabda037bf6bc13005712c52e19fe2ca
font_02_sfnt_off0001273d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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