Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52c825a4f70bdd1…

MALICIOUS

PDF

86.1 KB Created: 2021-09-13 00:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d206c9f70bc92b124f66e2e201d165ac SHA-1: 633356ec64249e30b1bab947d6d60c439c75bb30 SHA-256: c52c825a4f70bdd1954c7b46811392e5f21f607a03b814ce787d57122fe321c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/nunebamilozirawi.pdf In PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/81163410402.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/talipa.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/34463569189.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/98608564912.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109101004248422.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da8a4d27b1---789187693.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/7f2029924367bdd0d9e59569799d8691/ragodakolajilaxino.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/5037967577.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109031816189313.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/2901590ffb954d5b49982a3ef2f1fc62/9517118920.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/wuxifis.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/mexikuwejofefunoxesugar.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5c1f33803---fezifofo.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/mafimajogubixevovin.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/pewetutexikenebuf.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/pexefolajixozimedepaxize.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/efjuhv6an42ifbbccf5ceagth7/75841051180.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/tomipezeta.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/72138101039.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/88176783367.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/32198855893.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78431734393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+download+a+song+to+android+phonePDF 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_off0000eade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 18048 bytes
SHA-256: c62d5c866257f2c5b619e29c0cbd210c425def80711294b86843f2a7ec7b7b4d
font_01_sfnt_off000119e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E0 10748 bytes
SHA-256: 4eaf4b69523e47d40589bede01a7f1d17b53d8648579d2552071d4bdfde62a7a
font_02_sfnt_off00013253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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