Malicious PDF — malware analysis report

Static analysis result for SHA-256 56829792ba0003e9…

MALICIOUS

PDF

83.4 KB Created: 2021-09-22 14:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bc0d656e625f93e69487db15f31340eb SHA-1: 49c884f03471bbc2272f07d632d09182cc4b47d0 SHA-256: 56829792ba0003e909a3aeb516b14deda0fc7916c7d0a3b25682fd881132fd7c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://irlanc.ru/uplcv?utm_term=new+update+funtouch+os PDF link annotation
    • http://vanhacollection.com/images/files/pabekaxajodabomesani.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/jinoxevil.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/milizafopegigo.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/kevadonaxofobuwilisasaber.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/49189008833.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/nebuziragozufekobubogud.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/4042934507.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/0bh84kviljgq32nfe8blb25qg4/14161213333.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/29858072120.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/624441c0c5b5533bc5febd77cee4753f/tatujemepigokare.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/17642990606.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ca821666c1a05cf700c76efcd5fb057b/manesadukaxidotidejozag.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1d24d4c59---kixonukulonij.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/wasebevopixeja.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/26998048000.pdfIn PDF document text
    • https://ratodua.com/contents/files/pipunevimujexavapifujag.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109170543158588.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/bojigokov.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/filuwulokedi.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/44724156828.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/38658573888.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/50584800542.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/55310746895.pdfIn PDF document text
    • 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_off0000e151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF968 10644 bytes
SHA-256: 3eb99f1fb55a5fdf86e0574778c939b3683281f372032cefce49a7691a21aa2f
font_02_sfnt_off000111d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D0 18216 bytes
SHA-256: 4271aa67e380863be8f0cbd74771585d8e09e0e0f1525dbbbdb01dfb1cb6f0a2