Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b2ffd3bc2774ae…

MALICIOUS

PDF

85.9 KB Created: 2021-07-03 22:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11274d4f79e88a0e57421367865c4f8c SHA-1: 9337005548b09b9d0327dae4a61ac23a8753dfff SHA-256: 09b2ffd3bc2774ae44278dffad6c3c91992da97cb653da9de6904f2ecfb5f4ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were explicitly extracted, the nature of the URLs and the heuristics suggest the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pistant.ru/uplcv?utm_term=green+roof+wall+section
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/jjdcnsjfjm12vh4tmr2hqrdt93/82665647317.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/afaf92e682fa922175a0dab057ecf9fd/47912211874.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607207ed8dc15---14981812208.pdf
    • https://esperanzadeavila.com/fotos/file/71828300441.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/24352634929.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4983cb2303---78846796397.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/48ac61cedf02c9e865326a80e630e8ed/lamisowexarigiza.pdf
    • http://gilendor.cz/userfiles/file/wikurusokavo.pdf
    • https://finatwork.com/userfiles/file/saredowapajo.pdf
    • http://ddgasul.com/userfiles/file/41265599219.pdf
    • http://broadmoor79.com/clients/864886/File/kejoferadewafuvukatewuf.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/534626d6fa5bf25cb716f48bba838e87/sasetotujodovubu.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609272bbd8e14---42607011706.pdf
    • http://pwr-tech.ru/userfiles/file/bokeluseregepuju.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b754ec0b46a---muximuzisonuwurekadirar.pdf
    • http://thegroverestaurantnj.com/userfiles/files/bazurutudovugolekimitesek.pdf
    • http://songiadabinhphuoc.com/upload/ck/files/51303359847.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d264b0d77fb---71598098151.pdf
    • http://ibconsulting.it/userfiles/files/61064787843.pdf
    • http://colescastle.com/clients/875019/File/fikudupopomofuridepopak.pdf
    • http://www.naraihillgolf.com/admin/userfiles/file/fiwijawerotizejaximib.pdf
    • http://bannails.com/fckeditor_userfiles/file/51137813853.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/31dc6d6a7191d538f65580de78d3f298/nekajimunugovovipixubozax.pdf
    • http://gwardiajuvenia.pl/zdjecia/fck/file/giwajesamejof.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/b029e2202a9a271da660687f1419c157/dejupetibodogemodakugoji.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef8d.bin
0318f3a48840c3c4ffe329e59e3b1550f813e240eca8c6b7ecbfd9e797c09eae
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 16532 bytes
font_01_sfnt_off00011a8c.bin
963c2b0e0499db944b8e26404f0e24ee9b8d22dac73b7e68dca0cc0fffa3ab11
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8C 10452 bytes
font_02_sfnt_off0001327d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1327D 16792 bytes