Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e2b4ebd725e0cc…

MALICIOUS

PDF

82.3 KB Created: 2021-09-21 01:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 019018b2ece563619ea9084afe53bc28 SHA-1: 6bdbff01aca01005873996ad3f6e9dd3af10bb5a SHA-256: 48e2b4ebd725e0cc842b55c1d7956f24f833b75bf011d6f1582d92cb23ca479c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on potentially compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the links and the PDF format itself often facilitates malicious redirects or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mobitransjogja.com/files/redazalowonapexokenaza.pdf In PDF document text
    • http://dges.in/userfiles/file/xejopoliri.pdfIn PDF document text
    • http://congtrinhxanh.vn/media/images/upload/files/70153833036.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13171080811.pdfIn PDF document text
    • https://ocw.tw/uploads/files/vajisazodevojipelen.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/javajokuxozufaxekibezasob.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/fopuduraluzutumor.pdfIn PDF document text
    • https://fultoys.com/userfiles/jiluxedijosabigu.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/88323819021.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/3789982610.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138a3d27a200---60966578907.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/17785091882.pdfIn PDF document text
    • http://aibrpjoaae2.specialty-match.com/upload/files/6954736689.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614498a06d05a---59221208433.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/pifamelixapexam.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/61984855764.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/61737642930.pdfIn PDF document text
    • https://blugarden.eu/file/33194679600.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/wonemewoxiwapugajewebuj.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/82000186641.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/panovevibe.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143421c9a174---23096824137.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/29388759723.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109052254209001.pdfIn PDF document text
    • http://watch62.ru/files/files/dodetonomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=stickman+with+orange+pantsPDF 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_off0000da9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9C 11028 bytes
SHA-256: 6dcc96cfd16a2476c604fd8b74a7e34d310132bafe27b920af3a7236fd88ff8c
font_01_sfnt_off0000f424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C36 18264 bytes
SHA-256: 01815b2cabc8bdc20df02f3e599e3acbc804a9a0970479920970e20c9fb9ba4e

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