Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fc055d2debb83be…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 14:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 91fbc3c5008b570915c414c09889362e SHA-1: d74a5e72dd16b1cee9ea298aa7cdbc2a6dd1c5d8 SHA-256: 2fc055d2debb83be4f4b7e5a4a33a8d4cfc04f2c6556353c8323bcb1bfae48e7
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on potentially malicious infrastructure suggests an attempt to lure users to malicious 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 https://irlanc.ru/uplcv?utm_term=interpretacion+taller+hemodinamico+pdf PDF link annotation
    • http://diysmart.net/userfiles/file/77388165114.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c8b859a82---lesog.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/0e6b53f8fb23f6aced54e5aa5338380c/venunoboj.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/97489791740.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/4uusbv8leibq3gve9vfadkfkri/wanazitagupakogoxikuma.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/rupatok.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd8d9025ed---vakiwedusebur.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/4608531701.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/lubagifelonegapiziriti.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607080fbeba83---pibadadekonizutisediji.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/topuvoverid.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/funuserutokonol.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/keromefebilipu.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210710120055.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7ae58fbd0---29958501899.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/6f04770f48bdfcae48ee0d937c49f84b/zusimojetegududefenodafof.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4e54cf4f1---puvojirok.pdfIn PDF document text
    • https://asi-filter.pl/files/file/53616796971.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dfe7040a9---debasilawete.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/xusipaminubofetuzudid.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/vovilig.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9c5b1ce02---gijavalivod.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/82851880344.pdfIn PDF document text
    • 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_off0000d6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 10668 bytes
SHA-256: c44fe42265ef0f457c4f2850fe9e9c4b3e0902fc073f2761fba59c6a283577be
font_02_sfnt_off000106fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FA 18604 bytes
SHA-256: 58f288924329ebd94111f6513a325b6ecaa273cf461e7b49546f1ee6baebb07e

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