Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9cfb40497095fd…

MALICIOUS

PDF

81.2 KB Created: 2021-09-11 05:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 751fd143cd24105f066ae709d08b4414 SHA-1: bdff2f9cc87c3e195edad92c425dd54e39b954f4 SHA-256: da9cfb40497095fd9eff46ab1cafdcfa26062535ff472af11973ee92a04f37a2
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. The primary function appears to be redirecting users to potentially malicious external sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.ettermanenterprises.com/ckfinder/userfiles/files/zupidurupavub.pdf In PDF document text
    • http://metall-press.ru/files/nizorisamosaga.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/u8g322cl16odur13t07jjrup9s/76407676122.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/luweregujukes.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f8aa2d447---55804314109.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/mibavasiwufevuta.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/69147017850.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/zenoroxibuziwazajopo.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/wififenolepi.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/tuxol.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/furasezox.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/faxotijutalunofozuvaruban.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/2021922128128104.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/51957195266.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613782df992ba---kezewowixavepa.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/92393062761.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7af4ae6ee---16987403370.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/xalevuvozogexusem.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/58673845616.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/91269382032.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/55438298191.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77516462745.pdfIn PDF document text
    • http://minhanh.com/files/xilukisogemupikira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+take+screenshot+in+galaxy+j5PDF 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_off0000d638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD638 11156 bytes
SHA-256: 167de1433c1ab5bfb6dc92ed370e1d73bdaa7deb22f3d19d74ee203a4225c0e7
font_01_sfnt_off0000f053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF053 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10865 18272 bytes
SHA-256: e86b2aad7c6fd525c56c1c8e88d00ea7d28c10d3074597282a334f5eb29dff9f