Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff07b3a67e0e3c02…

MALICIOUS

PDF

86.7 KB Created: 2021-06-27 22:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6eb7efa00227088d962e32eb65b6ad72 SHA-1: 2b4c1210019ba091695a2f8acf86b1578c49989b SHA-256: ff07b3a67e0e3c02b85bb9d91c3892e589ca9df51ddb9c7db0890fda5645ba17
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites and disposable domains, likely for phishing or malware distribution. The presence of numerous external URIs and link farm heuristics strongly suggests an attempt to exploit user trust or curiosity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 https://irlanc.ru/uplcv?utm_term=new+jersey+board+of+pharmacy+regulations PDF link annotation
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/e584096c3a2b18fcf58f02430131d9ae/62486309769.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/65616549337.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ebfc0fed2---vedixojojikolaruxazetefup.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/3739b3e4b8df50115cf5c131a2817544/414970529.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c98b77c807---vosimipobamomulifonesufos.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c98773b3f---56326261171.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/95599989901630618d06f96ea944c573/27477793953.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085c7c6701fa---94531380707.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/cvfvbvpugf118h6n344u70im57/72893751651.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16201345308045.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/0d5fce7d29d4b8482d00ad9114b09142/vulolik.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160990c6c93398---23331392466.pdfIn PDF document text
    • https://faceless.me/userfiles/files/sidiniribugimekibuvaf.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096cab5139a5---zupamixigiger.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/29337959423.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/26013390486.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/93241dc72c580f8a2d60c9dca7086a8e/52349009220.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/45be60e4ad050398395b1411f9706bba/wiwotor.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/11134230044.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e40f54a75---busumozelixusuzitob.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/d37a55f891f363d97300cebf81612fc4/segoturenijokivafapivapur.pdfIn PDF document text
    • http://cbwmd.com/uploads/Files/17228855904.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/52835948333.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c489d370437---90419378664.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/rimulenas.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f9f929a67---8984856545.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_off0000edef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEF 16872 bytes
SHA-256: 3ef337be9fd912c76d270fe4155406829e062e1c20766a3c0580948608dd7b58
font_01_sfnt_off00011a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001323c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323C 11616 bytes
SHA-256: fd4480cc4b212d6bfa1e92031e8e09d5ec62de0bff2cfc3b7eac171808099d3e

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