Malicious PDF — malware analysis report

Static analysis result for SHA-256 b396e0e3e77ed50e…

MALICIOUS

PDF

75.2 KB Created: 2021-09-03 21:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0265da0cb17b849f0093c83d3f6aeec1 SHA-1: 29d02721d04f79ca4344e58e9b52df5ecc7a4f07 SHA-256: b396e0e3e77ed50eb488092f0ee97ca681a70ee9cbb98795b80e74cba493f183
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, directing users to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. The file's structure and URL patterns suggest it's part of a campaign to distribute malicious content through compromised web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://philabc.ru/uplcv?utm_term=mercado+libre+cortadora+de+madera+manual PDF link annotation
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/caf839ce670380d804747da21efc9bc5/10753588573.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610de1bd30c24---wamaretonegositedun.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/wadadebofujovufiputavora.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/17039176107.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6dafc5255c---17605881107.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/jilem.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/d9pgbje11tm278mr3elh3dp473/faxezejeberopufexo.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106faf5c88bd---ruzafifa.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/79449442e9e492fa9261cdc2f7c67c37/fodupaf.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/12740447968.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/bipororijex.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/7a766ff5e21b2ee46dd852435e1194b6/kajazafezonajojaxefo.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/demakemalemebakogegefo.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/fujowesasenifij.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/55412644177.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e817382768---56471738850.pdfIn PDF document text
    • http://chieucoingason.vn/files/firudome.pdfIn PDF document text
    • http://sns.hu/_user/file/lafatanorosaj.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/22d78b90892d3d9fe63f76a3241b52ac/5644136823.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f865b7243---4563889053.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/0c78331dd8ab433e85db2f5c789c6bc7/16919791587.pdfIn PDF document text
    • http://consade.com/userfiles/file/pakupabojurizijaxugas.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/mopotobusoximexosu.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_off0000bf1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1B 10596 bytes
SHA-256: cf5042d4f7cbdd0bb8e493a6ae5839b9efcf48e9897d13e789bd96944dccf50c
font_01_sfnt_off0000d738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD738 17932 bytes
SHA-256: 57798a512899af920ea51f107ea8366f3a2dc256488a978188ccd2e6b54ed2bd
font_02_sfnt_off0001053d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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