Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f5c57a53086e16…

MALICIOUS

PDF

97.7 KB Created: 2021-06-27 18:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: df444a7de032f9bdb8268f87f94e0acb SHA-1: a702a780fd42044c89904bfb43ebfb5daafb9ab3 SHA-256: 16f5c57a53086e16db22d995bb9e2f9f58e1eed1b58e8ee1a14890018239b786
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to compromised or disposable domains, suggesting an intent to redirect users to phishing sites or download further malware. The presence of a 'link farm' heuristic and the use of compromised CMS upload storage indicate a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://chinalanpa.com/images/upload/File/7177779475.pdf In PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160768d908c4d1---60880426234.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/33955623980.pdfIn PDF document text
    • http://abpaluso.com/upload/file/gipojuwimumodogade.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e93f960169---toxekapezolaziwetexoxufex.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/fad15fd99dfe5b7ee43829e09f066905/saxususakivuladep.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160762560b35ac---48416567074.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/zijopuwosebore.pdfIn PDF document text
    • https://tonitomov.com/picture/file/rateduxifozigig.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/vaxuwe.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/zunajovigewogatitisidofo.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/49187567394.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/gejov.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/24813265630.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/visifuliriwuzajir.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/xokaganepita.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/7341bbfb1af886a9226a55e00d158e56/70354053754.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e382e51196---29843876847.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/xuzanovilix.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/94525553151.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071ebe4e6876---42296227124.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6b3c464a6---vifilinuwolexata.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/86387134118.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082607825686---54480206921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=gonococcal+infection+in+newbornPDF 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_off0001190c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001311e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311E 18552 bytes
SHA-256: 81fbf2c7d23f541e2bc5ccbf7fdf9d64bb2f1b6dc4e6c64ca48675974dfe1abf
font_02_sfnt_off000161d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161D9 10424 bytes
SHA-256: 7701b5e851fd91eb2e954a436b00ce07f8cb400bd93eaabe4ea98beb617f0172

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