Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1751c11083dd6bb…

MALICIOUS

PDF

71.3 KB Created: 2021-06-29 17:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 55870638360f74078f5a29760ca29e67 SHA-1: 4fe6860abfd7ac229817110ca0a328bd2d6b34e9 SHA-256: b1751c11083dd6bbde0797543a0d405cf32431ece1dbf4de7e22e0a892c9825f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cafb300ee34.pdf In PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/hd050aa566a6lhrfj14o4amspu/47546753460.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7107018792ccc6a202784ca97c0489a7/1231371351.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/firupalokutew.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08d21b99a7---48704578706.pdfIn PDF document text
    • https://seerupit.dk/assens/file/panoga.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03a9335bc8---48000233251.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/vejuxozazogakomuri.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/60769311215.pdfIn PDF document text
    • http://fotossc.pl/_files/file/sidifonelufafedefibekeg.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/181692724e7d40e82f29cf2d40f39c7d/badalasigoganumul.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb763b0b1e---pegegekabuzeluz.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160761c8229263---zeguxexutoziluvoleru.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a20119636---32501521651.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/14955444146.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb0655b504---29258162197.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1df6e120e---49308800552.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55469cc3d0---zifobejilemuwemozo.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/musugafaxoku.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/53742037678.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/17385540313.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///42383250600.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/56213392124.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/taferofajugad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pdf+good+to+greatPDF 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_off0000ba33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24A 10120 bytes
SHA-256: c6c2010af61a6e48cd506f386a4909fbb8bdda2229b0e387aef06711456a60aa
font_02_sfnt_off0000e8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CF 15500 bytes
SHA-256: 8ec223c24b17e9d291b01cbe886a81196ea0845a94fa962cb5b82aa7ee877163

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