Malicious PDF — malware analysis report

Static analysis result for SHA-256 effb35e1b9c82dda…

MALICIOUS

PDF

93.0 KB Created: 2021-09-07 18:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2d191706126ac667fc6f62ca4422c91 SHA-1: 110e96431673020d9538ef575a835f31ebd30208 SHA-256: effb35e1b9c82dda89bb184c2915211bbe5e5f7e855903af3225c92ffd1c348d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to further malicious content or phishing sites. The primary function appears to be acting as a link farm to distribute malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://iberryhomemade.com/userfiles/files/wizivuxuvapavib.pdf In PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111e77125922---bewobuwenevilogezage.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb6aa0c979---99298818155.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072efe148073---pamilomupaben.pdfIn PDF document text
    • http://atomleasing.ru/media/File/56666860138.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dbec9bfdf---55574774824.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16083c714ef7cc---jobaxunixisisisujuxif.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/80233930961.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/xopuzunijo.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/1ts3pba5u4jm0bhg0pb7kruku5/79492905394.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c20a14c22ed---somudusasunabobiradagede.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/zebejasomesuz.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/88567707041.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e6000577f5---titizixe.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/27co1jbp31crv582emu6o096q3/3278149229.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bd642915a86---27573641699.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/d3292d18d81b70e694ea98e3488a048f/xojugomavopaxoxusifono.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/14120149564.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/rjvuesfc1tcpg4uso2his1jf7u/giwovigopoba.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c851b58d09c---43602043147.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/71896439781.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/65863848099.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607e47014ac8b---kijebabifekak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=plane+table+surveying+procedure+pdfPDF 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_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 11216 bytes
SHA-256: bb4d1f264924147986d9ead89cb3a2b7e5c5a9bb103b58cf7285172a39df521a
font_01_sfnt_off00011d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13535 18908 bytes
SHA-256: d9574bc3dc2a4606735168e3ced4ab1b9452bb10b1294e4f6b3536a3641790d7

Open this report in the interactive analyzer, or submit your own file for analysis.