Malicious PDF — malware analysis report

Static analysis result for SHA-256 959379fc22772b0e…

MALICIOUS

PDF

71.9 KB Created: 2021-09-04 10:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c25a86df7cb86980270360c6e7ce5ad8 SHA-1: b213ded0535e74c677a3173683710f760b956a49 SHA-256: 959379fc22772b0e5433efc78b1a2a28917ce37e28277e5e7d80e750e37ad5df
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content. The file's structure and numerous external links indicate a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56109d4d04---69574516783.pdf In PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/fe8fb55f334c62c1de2c93ebd00265ba/wurosuwozusibavokukuvotov.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/vopibelomidulegunefe.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/lumugenekotozatofe.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/c6e9a7c33a50c4932159f0b38711134f/41011039600.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b085f046511d5534a658f9098f3b4025/4443348904.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/adj2e9ltjhgcegvi9k1r7ha8oe/37007621959.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3a9d825b837e00cb6570442c9f484599/97654079847.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/nisuxofukolubuj.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/83182552248.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7737d12f5f---murogosinexuvurorenoj.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160836e42afc36---gowixudivexetasok.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/16525403197.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/ninorowew.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072c3435b345---fipela.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160baad27e0c97---37418676270.pdfIn PDF document text
    • http://irinabailey.com/upload/files/sabudekakoleravajij.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/84225848220.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/57411373845.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ffal0ai7tm1klug11hfree3da1/84503354456.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7387f50c67---vozuxakijuzenenoxiko.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/88175949867.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6da03d37ec---gedegiginepadirulifo.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/mefasaloperufezetef.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/defim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=mechanism+of+adaptive+immunity+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5D 11012 bytes
SHA-256: 1ee9635a663ba1c2f97434df6d78097a4f7b451ad970576c5746d230d47436b2
font_01_sfnt_off0000d4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CC 14944 bytes
SHA-256: f73751409b51f200c6bb772c8c9c7530d03c9f33c26a2da5ff6a119c782c6955
font_02_sfnt_off0000f9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1