Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aea505ab75c98be…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 11:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c2055a9934c28b481f5435766350029b SHA-1: 91ad5d1b5cf2c4eb2b4e92ea7eab66d40554fbb0 SHA-256: 2aea505ab75c98beef3c6740ebaa420ca7280e86bbeaf9dd3aebebbc901e7b13
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, likely to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/58127656078.pdf In PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131564839892---20519351765.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7daeb3f10---10666352652.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/daa97de8bb4700d8981ba54926dc5f6c/sovulamumidomavazona.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/19875105962.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/moruwilalopov.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135953847acf---sotobajivamomi.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/dedip.pdfIn PDF document text
    • http://josquin-capella.de/download/76952876009.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/mebebokazevon.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/movenakuvipivudoluxudes.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/21596317040.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/gudemikipinigedaten.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/xavos.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/91224348104.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210918120522.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/31709773419.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/42600793558.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/13c9332k5cnrh6c0nvuumt41gr/rujufesulonagojemo.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/15517206520.pdfIn PDF document text
    • http://minerva-collection.net/files/files/rojawewemefiwekabifita.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/64825530008.pdfIn PDF document text
    • http://bdnchem.com/upload/files/joxizejazopipaju.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/lobirafazaxapegajom.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/87869637150.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/lurase.pdfIn PDF document text
    • http://bamila.vn/luutru/files/28032913230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=simple+mmorpg+androidPDF 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_off0000da51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 10544 bytes
SHA-256: 5d3607fe6837f3f086591aeadfe6bd96592bc356c1227bd4ab3a33a89998fe90
font_02_sfnt_off00010a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A17 17928 bytes
SHA-256: c10cab0ef93d810af27f01844feeec7dae8b26e81a2f0224fb718db725ed82b7

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