Malicious PDF — malware analysis report

Static analysis result for SHA-256 5355e896b55cd443…

MALICIOUS

PDF

92.7 KB Created: 2021-07-20 07:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f6b60e58aed2b22fc49e14826d45f98 SHA-1: 7abe33bb4ee5f0206b01ca091d3f53beda88befa SHA-256: 5355e896b55cd4435dbf3e3fb8db70bbce0e61f5f94d2637718a96b57e91fc93
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://alituncer.com/userfiles/file/wawupowikivaris.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3eaea00fc4---79711823624.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbe3af6fc0a317ec6ddeeef4dd8599fa/84994873027.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/f0f2f07bf99cc4f318b63eddcd7cf050/17928712354.pdf
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/manetixodafovuponog.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/1d3b3a659ee7b5ddbb1cde857726fc80/wikonetapowerevabaf.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609319f3b6f0f---jixudalosi.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb356f348c5---91424872814.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce8ffc28e2---72728344421.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/dkit7s8k94n6sdueommpln077p/1277883171.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b5bdd0c0867fdde424552c412eb1d50c/gofovixelek.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a98110edcec---74067176097.pdf
    • http://hersheyhigh1981.com/clients/37302/File/60212403137.pdf
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/gexerafoveserifuwos.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9a1670eda4eb65655657be15bb643560/59423417787.pdf
    • http://daegyung.kr/userfiles/file/20210718194230.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076a3e37af54---nabiwizata.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/5f2d5160e5c3619b30acc389bfb6d7a4/dafaz.pdf
    • https://aprilboya.com/userfiles/file/53514188733.pdf
    • http://kmsenior.org/file/files/7878669696.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093af91853c4---witepewutagu.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/717bac5f023ffef7a941ab5691b27094/32774181200.pdf
    • http://fouladsazanco.com/Upload/file/85597587128.pdf
    • https://ringid.vn/ckfinder/userfiles/files/83823075083.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=on+the+positive+side
    • 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_off00010958.bin
df8062079d81f23512a6d126ad80e3b35b64180c3e11b4220ccf674b012f5580
pdf-font-stream PDF embedded font (sfnt) at offset 0x10958 17472 bytes
font_01_sfnt_off000136ba.bin
d2e9abdc0ecbfe4a6845edbe22477650284b70d768f5056c37902e88295016d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x136BA 10272 bytes
font_02_sfnt_off00014dd8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD8 16792 bytes