Malicious PDF — malware analysis report

Static analysis result for SHA-256 537bd187b7ef04a1…

MALICIOUS

PDF

88.7 KB Created: 2021-07-06 21:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9adf1b31e84db2c5a4a0012824994e12 SHA-1: cf5da803ecce6619391d67b11b0f845812ccc483 SHA-256: 537bd187b7ef04a158f7ca7efe9e8d529138cb913f2eba4911ac0e9f89422084
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oreade-breche.fr/userfiles/file/24984249641.pdf In PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9ac52bc0aeb5f258d851195f8fc0a069/23068401848.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/37611475256.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfec4aff7d---puseriso.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074a29317e27---61491302503.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/saxopajozapurosow.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708648dc035---ziratijakexulazezapul.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e4f989ecd---26793500871.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/4reapo2dj1ed4bpeojhc09bop4/tupifawixuluw.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/f12267d9c874f8d36eebe41e2ba7c498/98537119545.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/devowuvumowudedupalugafog.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/86944755280.pdfIn PDF document text
    • http://jarosi.hu/files/file/2650021157.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/c7e024edd3f43f322107db1b7fb0c2bc/kaviwetelowovu.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/u8p740cd9q7c49e01uam90m98b/fafovek.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6acb529545---rupok.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/lamafew.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608330022be18---zapivagipajid.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/29601512439.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160701d9b5c419---6545399107.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/17352972891.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/60440513106.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/tuponipizubido.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/gunodaxemafedup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=dystonic+tremor+and+parkinson%27sPDF 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_off0000f625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF625 17076 bytes
SHA-256: 0cc39ff20f2c304cc5058e8620b55783a6220700d59d48c4b95bc893c8553f79
font_01_sfnt_off0001224b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224B 10872 bytes
SHA-256: 3c0b30e62b2288feafb2fa9182f6d1de9a777d89871ec94fa843c3219dfcdb6b
font_02_sfnt_off00013b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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