Malicious PDF — malware analysis report

Static analysis result for SHA-256 100fcceeb58da5f4…

MALICIOUS

PDF

74.7 KB Created: 2021-09-18 19:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c02757ed7525beb4b7b2af42d04a64fe SHA-1: 538da69678efcb4bdfabb27d47d1419518519653 SHA-256: 100fcceeb58da5f41d9fe9d2b42b82ef121eb0d153263e26a1843a393f5b0e0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm hosted on multiple domains, some of which appear to be disposable or compromised, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links, many pointing to PDF files, reinforces the attack pattern of luring users to download content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://justsayhi365.com/uploads/file/boburizedisuvoxo.pdf In PDF document text
    • https://fo-prefectures.com/pages/files/28255492154.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/rixesered.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/19279147824.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/supamomipujiro.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/matenozudisumunu.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/65498130404.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/27699133425.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613378e8e25e2---33187349518.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/2896108162.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/zowapalu.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/negirekabezofiminojegu.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/tozawizigexarovat.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/2385815854.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/71259953046.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/2986188197.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/vodifagev.pdfIn PDF document text
    • https://atlantidegattico.it/file/67639086465.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/voxukafok.pdfIn PDF document text
    • http://lecostationery.com/files/file/zixoganokamixuvaligemij.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613baa89eabcf---98254941210.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16135e5b061ddc---wutive.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/vupibajupuruzegodariw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=gobiz+apk+downloadPDF 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_off0000bfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDF 10304 bytes
SHA-256: c36b0743e26736db5c3bc216f7c1ce2aa746b87518b254b0246554a4363df405
font_01_sfnt_off0000d701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD701 18004 bytes
SHA-256: 8fe64afd0155311ea97121007f43931c0f537b928814e42964f3918385fa4130
font_02_sfnt_off00010573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1