Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd9caab024113ac…

MALICIOUS

PDF

104.5 KB Created: 2021-06-25 16:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 909a9de77d18e725da8326863310be5d SHA-1: 1c0ef7ac957633a757c4b8a54ef4444fa2be9d8a SHA-256: 8fd9caab024113accfd34ab5c88e45d88e3753aa6b41cc284259aefab6b1f4cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many pointing to compromised CMS upload storage, suggesting a phishing or link farm strategy. The presence of external URIs and a link farm on disposable hosting further supports the attack pattern of directing users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://oniceh.ru/uplcv?utm_term=it+chapter+2+full+movie+fmovies PDF link annotation
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a042b7053b7---56519894963.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/d00e944428448b8b3a6d2c1754795d5e/palufisoselojenis.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/24909936486.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce91d53207a---79158673718.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/belovoboxopizizutika.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa976e98989---diwikerapuraduwukafobawe.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16085c6f23f3f8---33503456899.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/tebiku.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ec4c0c37e---fitijixipevato.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/501dae91d81bf7358577d9b9ed61412f/63673604680.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a74008073b---xonevefuwiwexezoxefetuj.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/69881496844.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e0b6aa45b---rezukujufiku.pdfIn PDF document text
    • https://ebooksweb.net/files/file/lazakogokinafefazipebiv.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607051750ed61---3476819832.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a701afd17---zajarami.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/d910c6ca5174ea0a1e5a907b810a67ea/37826823546.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_off00013479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13479 18160 bytes
SHA-256: 1676f03d24b28dd309b53ce5d551a9395bbd73ab8f7928865f017ae42486c7f4
font_01_sfnt_off000163a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163A1 10876 bytes
SHA-256: b0d982f16ea03e2a588db21dba0fe1904f7b8e136437e559cce9066d216fc15a
font_02_sfnt_off00017ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1