Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b2014b8e8091136…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 01:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 014601488838988a2ced95b773e727cf SHA-1: 2d1ecd8d37853353d5060dec1cd242c48958c760 SHA-256: 7b2014b8e8091136d81c8560eecdff1b5b9844542c48196b00f1c16592e63d37
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. These URLs are designed to redirect users to other sites, forming a link farm likely intended for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=android+emulator+record+screen PDF link annotation
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/f6227194ba1b78312211a630ea7e359d/65035735140.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/denoxok.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/xasonodazipovu.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/80452613477.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/63453149004.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ecf3d7f77---61078863349.pdfIn PDF document text
    • http://tzsunup.com/upload/86879487705.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140e46d765f2---81937410114.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/61300c642e823.pdfIn PDF document text
    • https://slide-bearing.com/d/files/34876379059.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/58106785791.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614206836c410---viruvesolixazobu.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/gikexugaxamusutatesojitar.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/25297161191.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/8886929898.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613435151358c---lewemivimatukegalux.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/bigawemegopupaxe.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/069d1d7ea194ea42146f2af76487bac6/folefamaviwe.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/gotiwipirikomajokawuwake.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109010515211003.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/watodabarokesot.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/13639621034.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/52312108419.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/tetirowikasos.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/84835566100.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_off0000e45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC76 10612 bytes
SHA-256: 0527b35ef873f790d28f623aee6ddc01a5250e4c6cb014fcc610cabeadb50d90
font_02_sfnt_off000114b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B7 17848 bytes
SHA-256: fbc384132fe346151b648d4e5240577a31a0af379ae81abefaa46fd409b5698b

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