Malicious PDF — malware analysis report

Static analysis result for SHA-256 98903c4bcd1afd19…

MALICIOUS

PDF

79.3 KB Created: 2021-09-11 17:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 590450508b4e87ba67173c52f41658dc SHA-1: 880d2cdda43d49c7bb8ea14b61cf4c9fd94029d6 SHA-256: 98903c4bcd1afd198371af162cb4d73cdffc5b4389e0889fc5f50616df8c26f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://jurabos.nl/include/editor/file/kosono.pdf In PDF document text
    • https://totounited.com/contents/files/fexewepunakokowidifuzevu.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/xupufagixisiwexo.pdfIn PDF document text
    • http://kaies.net/upfiles/210908074205056619m3xirx.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613180bf81b90---77487006257.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109021736162551.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613acf7de5e0d---jusila.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/54213837196.pdfIn PDF document text
    • http://belv.ru/userfiles/file/pojozatomifebirum.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/c28d45c2d41134ed81e18f1f750c27b6/13947853571.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/jegotejokof.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58912053227.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/52614449354.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/mugafesirageti.pdfIn PDF document text
    • http://4yoga.by/pics/files/38252284903.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/xefavizapirebipifukogo.pdfIn PDF document text
    • http://mamam.by/upload/File/file/waxonumetaboxegipizop.pdfIn PDF document text
    • http://ranchobg.com/img/file/94279831552.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/42507571287.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/33039461157.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8d35a88b5---punug.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/bugafu.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/varugol.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/60157232419.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/73400439652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=best+way+to+facetime+between+android+and+iphonePDF 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_off0000d0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AA 11232 bytes
SHA-256: 38fb3b334086b511d65804860270299565918f588197d8401dcb44c68ffa06e9
font_01_sfnt_off0000eab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB2 17328 bytes
SHA-256: 03216438395a6f9c0f7c9b0df199f212510f7bde5bc8052f737fed0a585553c3
font_02_sfnt_off00011743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11743 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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