Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13dcd5e9e7c7993…

MALICIOUS

PDF

84.5 KB Created: 2021-06-30 16:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f93f5ad13796121227f0db0b7808e5c5 SHA-1: 8777c3fd25821b611a96f00815a570c8c905a5b7 SHA-256: d13dcd5e9e7c79933ed62bd2723cca5c30998cda5f99b5fc4d4637350f62f0b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery. The use of compromised CMS upload functionalities points to exploitation of public-facing applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a70beba5aa9---82476787576.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/b4a3aa3500a5aeda1bab88d610e52667/vazaletu.pdf
    • https://adikkedua.com/contents//files/32324102192.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f21598034---ritazi.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/079a781dc4dde0846efe0fda5c8d148e/kafevige.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd57d4e87e---21693000555.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/fa9rs2fe159b9pg8f5p8o4qu5j/29104051866.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/8rff1p1ehruqr5e3ch7ffc4sfr/76071280006.pdf
    • http://zabradli-znerezu.cz/userfiles/file/68265356571.pdf
    • https://ancoraeducacion.com/images/92006956459.pdf
    • http://medicapoland.pl/uploaded/file/dopiwugo.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160785d76eccd4---72340035470.pdf
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/lesllaq0v50h8s55k3impfup06/roxafagateso.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14b2ee3fea---fudaxopevuxo.pdf
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/40265097291.pdf
    • http://hotelbelleepoque.bg/userfiles/file/88129893103.pdf
    • http://strandedtattoo.net/file/wujidobiwirunapevi.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091fd8a1c48c---zazupisawaliweka.pdf
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/13678926803.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/16853285549.pdf
    • http://scard.vn/app/webroot/uploads/files/65781795407.pdf
    • http://pgnsualumni.com/clients/872691/File/minonebotoker.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/7cdd999a78b1225a502b16d5cfa62034/ruxijejixomulunowip.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/bffc349b120e9a0d2e980c26961b9962/gupusupimuzojorogosi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=should+i+text+him+first
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e988.bin
18749d0ec8afa82194286471a10b6756126f863099cb021e65f4e02efbe3b8d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE988 10632 bytes
font_01_sfnt_off000101dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101DC 16792 bytes
font_02_sfnt_off000119ee.bin
d0426699525585c36f33ca1d166a83976ddda943eff415af43e14a0d36d5dc7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x119EE 16772 bytes