Malicious PDF — malware analysis report

Static analysis result for SHA-256 20679ab4a550a73d…

MALICIOUS

PDF

101.6 KB Created: 2021-07-25 05:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: bf36411de4b66af5b729911880c21b55 SHA-1: d6a13cd48c935202181cac272835f6dc2c7b6eda SHA-256: 20679ab4a550a73d354632304553da50ae679289df162c82cd2feeda1422352b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0312c1a9d---rijopodevaposig.pdf In PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c89e206c335---23916158380.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb9e00933a---vukarikalesuxurukiname.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/lixezereduwozifigoxeda.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/23041897869.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb86303557---tizexunuvijimifu.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/36450868210.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/7a5c0b836ba9935e4d4bb130b782b868/23443791440.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/c02682acf39926f616725a795df5a56b/fukaruxixejorejava.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/44783262418.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/84043202987.pdfIn PDF document text
    • https://unitjaya.com/contents//files/52667510103.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/79288207768.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/tuteliz.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacee55d43b---21567069120.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/dufuropon.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/82548943236.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae20052a903---mokivirikadosijesopolili.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/jetaxuxa.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/t4ocoq8ur9jht1b7rn8ln8c93i/59302437891.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/37609770676.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d451250c73a---fifikagewidaxodebepaxexi.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5d604432c1---komefegepefesu.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/d283751650db433db02ecea39cfd2aca/50105761577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=trading+options+for+dummies+3rd+edition+pdf+free+downloadPDF 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_off000123a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB9 18524 bytes
SHA-256: dd95e600bd502a146155ef8e48458608b869e58e76a57d1e14748007515cf943
font_02_sfnt_off00016c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C54 11164 bytes
SHA-256: 70ac2b93bcd33fa0a550be52bebf0d3aadbcf89ad8019a24d25ac38ab1f3449f