Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37ed711a701a2b9…

MALICIOUS

PDF

84.9 KB Created: 2021-07-20 06:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f3068d7e19e4fe8d192c0804b0882b2f SHA-1: 0a05f93ffa3a9999ce5f90a1dea00cb60f1151c6 SHA-256: b37ed711a701a2b9fc9fe4889e3488ef184fa3cce5db3fdc9e83036588a78145
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to websites hosted on compromised CMS platforms, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites through a link farm. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/aljfh1adjrdi9bqed6kakjk0e5/16586447536.pdf In PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7d7458bcf---66682614217.pdfIn PDF document text
    • https://greffedecheveux.center/upload/ckfinder/files/jiluwaxibuzedefuwik.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/11683255616.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/4f604bf9c81ca16c966c124cda4bcef7/negirugizorot.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf547a733c---61310968958.pdfIn PDF document text
    • http://cocoal.com/uploads/file/funesiduxiwelisasave.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/5d4facc694b141518b9f637594d2d4c3/61286715893.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c98b61865---jivovuxu.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/70146514561.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5n52voo6ahvbgtb5k2jdl1le32/muwowekikanozora.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/wakeguxeforomafe.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a9970d681---91363724055.pdfIn PDF document text
    • http://salkim.com/userfiles/file/82035543739.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/h5lcuomh0r093hbhvnghqvei10/6391646001.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/74648830359.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/9029219747.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/bjjohn3nima6pnlg27q3gpeobm/panetidadutolobo.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/jacc8kgjae184c9rit36jah1j7/bewefaku.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073c501a1693---saxol.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/815f2c6052717f1650dc9f23b851b4f3/kabajemovewovuvusa.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/5bb9cb7707b801c672ce8142bd832760/xalipoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=business+owner+operator+resumePDF 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_off0000e821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE821 16972 bytes
SHA-256: 6e3fdaca3026824279654aab85d277544ec9cf2ee883ab92dda5e267693c51dd
font_01_sfnt_off00011452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C69 10604 bytes
SHA-256: 69558a3d4e227262410cf5a31efab91344d6b67a49a2a6b3b47c0351262ce9c7

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