Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c4880c931ed43d…

MALICIOUS

PDF

97.8 KB Created: 2021-07-31 15:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ddd427bfb1440e052eee1145f22e501f SHA-1: 66a18df9b9065535679679df857582d00c4741fa SHA-256: 38c4880c931ed43d3f3f81110ac119d8fa26bc30f920ec15b942efb042473de6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9880

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://anukulagrotech.com/userfiles/file/68229142719.pdf In PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/rafawesegu.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/3807c3e64fd062fadf8f28c73c3e555d/jowurobujavimasi.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/betiperowozizezun.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072628006fe0---31496034425.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831bcb674cc---97649618558.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/379717ceca7a8c2774e45ac2f6da7a96/47998375765.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1082a32f5f---12723866404.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/mapopewesivekegosot.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c05684dbcb9---kibediximikikebo.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/68estpcjbbnubb9gomkotpn49s/zetebawulene.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/18033399335.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/2495626910be45323b8b5fdf43128a23/36556251908.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/bawep.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160ae32e4b1ba7---83086620454.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/90743587382.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/nofusuzoga.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/0c0c6cf44323f07f09f8f12ed8926e3b/26160753581.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/26762346777.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/jukurogigolibovajufedagij.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/gixixuvodagisagojopovuwa.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0259ee73f---lemoku.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ninotizadubem.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/bfe75ab3f52e7d6d95d6a6c5445f5709/kosofibuzituvogila.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/cmr64e6127u3i2vmos8evp0dt3/xuvurikezitanojoxupewo.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/40076589188.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23d837e81b---25217984788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pedal+go+kart+for+sale+near+mePDF 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_off00011a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A59 17328 bytes
SHA-256: dd0759a55ad02defc90d96cb94aa5c44a9956df666198130e3d98bffd6177ece
font_01_sfnt_off00014785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14785 10700 bytes
SHA-256: 3f68cc5f3d9e0186e0a3d383be247f44f127edb2951adb95e4240a30a32c5612
font_02_sfnt_off00015fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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