Malicious PDF — malware analysis report

Static analysis result for SHA-256 519df3efdb3e663f…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 18:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b44238f06a35bd5a657359f00db977b2 SHA-1: 7a383447caea3642905188ead6780e7ee3b7f65c SHA-256: 519df3efdb3e663f46980f3b9f509c177dfde50cf0e4abdba70c36ec77931b1d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or exploit delivery mechanism. The embedded URLs are likely part of this lure, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e012e6a1d5---49367511959.pdf In PDF document text
    • http://valdhans.cz/userfiles/file/komotilamokidopileboge.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/686c8b97dcb79df6f5d413da09b831e6/93744952368.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/86103228131.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/71688432421.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f428e31655f---15233533060.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c4b39e04---bexobamode.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/jexugoxowax.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/denudesejaxagexunum.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/306943e7c33bf898b3118d19d6e227b3/54170950930.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/31873204466.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/sosiwajiriwanedir.pdfIn PDF document text
    • https://moolans.com/uploads/files/vijavagatenu.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/37718509521.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/19161834975.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/zuxupug.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a57359d2c8f---38976378269.pdfIn PDF document text
    • https://guijek.com/userfiles/file/masanexebu.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/94362ac77e96bea28ce8cfa1bd60fe99/sukubilopavog.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160abe33be46ec---95759824877.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/loxiruwajawa.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/mitakt6ojq583kedg8j0ulu5q0/76656111978.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/pozujafijeseresu.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/c47387691215e67bd27c02561bb2f575/49332125076.pdfIn PDF document text
    • http://melvin.cz/data/65663882373.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050900493478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=basics+of+c+language+pdf+downloadPDF 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_off0000e266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE266 10836 bytes
SHA-256: ef3b6d6130335b1f9a63bd4ee1bb6996db9edc0f4aa5e4ce8b303a1f5a1a2721
font_01_sfnt_off0000fb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11376 17760 bytes
SHA-256: 8005ae703c5822b56c0de217ab17c2365fb410c7d5a09bb99c429623e7d4cf95

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