Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7e7790fdd70795…

MALICIOUS

PDF

78.0 KB Created: 2021-09-17 04:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fcd46b534c848300d95cb5f46f6e08b9 SHA-1: 0766fe3868249f43dedb78b86b2829c9c77bfbe7 SHA-256: 4c7e7790fdd70795f2ab071f760f6be9715a270e9b5bfd624a30e4a6d26f6441
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. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised CMS platforms or disposable domains. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, suggests potential for further malicious actions such as downloading second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://abnicum.ru/files/file/liwiwuw.pdf In PDF document text
    • http://neonatal-surgery.ru/userfiles/files/xatidesi.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/10930502587.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142369c2ddc0---39356613462.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bb937d6c3---sowabuwiwubevugaravazi.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/g90bf9jcmrrr1f4e3ae5v27dp0/mafabe.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/49274958205.pdfIn PDF document text
    • http://synowka.pl/galeria/file/putoranobogobikusixas.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141de2bcfb67---kogevevova.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a7a886ddd---tifupudelow.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/97413132009.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210917_D0AD64A98984C1A9.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/sulekifipiwawobip.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/54449335034.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/fezutobafur.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/59443887842.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/b472c34fcc24f8184fd255ff1a2b839b/vovigiwugijoro.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/tuwironibixinumiruxapu.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/81660485360.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/xupelaxa.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/xujajaba.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133d6f8d42e9---napapejuz.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614198bab35e2---13226968234.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/905c69201626dc6ecf8458cd8f9c7e19/1887337475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=free+realm+codes+for+minecraftPDF 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_off0000cbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC7 10616 bytes
SHA-256: 16768d8b349034becb3e37c7d1af5a153b05ead2942ec27ace5beac1418e4da3
font_01_sfnt_off0000e3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F7 17944 bytes
SHA-256: 25a2e5a9d1ce0383a5f99ede22da711f8380defbcc92ea07837d00660212942c
font_02_sfnt_off00011243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11243 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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