Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05f2d2a96d49a43…

MALICIOUS

PDF

83.9 KB Created: 2021-09-03 07:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0026fc456606e83107c0e034c97d559 SHA-1: ac6f82d2df7c6fea5ed550353bfc9e1e878904d2 SHA-256: c05f2d2a96d49a4364059e7d9ac3f83044881c2d34025cecb1dd3750176dce97
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised or disposable domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of link farming. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to manipulate search engine rankings or direct users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ossokahve.com/upload/file/gamaxuvawo.pdf In PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/99466700904.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608959898cc34---717204085.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/pupimi.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/laxilusuza.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/moxadebilegofolufo.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/89855514441.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/1120dd4d0739a794dd7e76e94df78165/below.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/jaxapi.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/lesen.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/muwadamevudapusuzawifo.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609de495a00de---reseduxamedusofu.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/50921316901.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/af1f444d8cbe27416d2afa6d7516e880/93514595625.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/eb408b37d70d29eb405eb88ed8296844/majuv.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e6778c33c29---zilunolik.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/repuzev.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/hjest0pk2ep15venguupuunupu/zetepapekumira.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087bdf3a92e4---60895323796.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/62515136944.pdfIn PDF document text
    • https://le27.fr/docs/file/mizigole.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/78603112221.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/do8fgd3mij34kkcs2ebbhiq5m4/vudisefabetodol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=free+pdf+splitter+portablePDF 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_off0000e48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48F 17452 bytes
SHA-256: 0cc239978315cd33c095f01ecece7b40531d394559faefa14e67f2f4fe07c97e
font_01_sfnt_off00011242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A59 10504 bytes
SHA-256: e0e08ddf018121e86894eea66f869b3982cd8edc3e33215115741fff3acd8fc8

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