Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a6110cee696919…

MALICIOUS

PDF

84.1 KB Created: 2021-08-29 17:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4fcc92076b77af7a3405f34e5b9f4cb2 SHA-1: 2c672874124442998b80ccec00c3197f861590a9 SHA-256: 45a6110cee6969198801a3d8c19c9ddc1b6324b16bef9e4be66df94cafa6f060
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring users through a malicious attachment to a site that hosts further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c56d3f2c9---13595328859.pdf In PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/renimixix.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/sf8kl2a60v5vfen99vts12i8d8/63379700030.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/99219741034.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/52417695060.pdfIn PDF document text
    • http://qzgj.cn/upload/file/beloxejofukopibafuxes.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/vapokikurago.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160976ab2cef8b---42381299245.pdfIn PDF document text
    • http://lblussana.it/images/file/3575821155.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/duvolidubitetida.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161117727cc41d---zidek.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/i7q91pt0rugquch83am00msi8m/zejafapofixojen.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/126b41f6e62e56238fd9af6a2e24dc6c/34700380749.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e236d8d0d---nakolulimejedada.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/90832921378.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5a5d6ab79---numuvanilotivujokutok.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/tufurexanepawusazurukiroj.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/velimololeje.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/fixevaba.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078921750d6b---3389334421.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/5d2bd7af2f1d50204827b49fbfabebeb/bazugafadexapududubepofe.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/37698430829.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/23/file/20210723_003653_167.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/86971016434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=passive+voice+games+online+jeopardyPDF 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_off0000e1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EB 11068 bytes
SHA-256: 78b1f07066a6d22406e5a774838d68db6b770003fd0feb14a67336998d1668d8
font_01_sfnt_off0000fb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB72 17880 bytes
SHA-256: 6181796011f3455c33b84d5819c11909d44d4eb75f924c1f483e5536b102ba3b
font_02_sfnt_off00012980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1