Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f375df98604794…

MALICIOUS

PDF

69.3 KB Created: 2021-09-24 18:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65790c148b89eb9039060690a03b9fd0 SHA-1: a6a511e474e0017782ffa4e1a640a7c069cf086d SHA-256: d7f375df98604794c29b982cf8988d8e9cf13aa3dccfb433058bb780a0e07df0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a large number of external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute phishing content or malware. The primary attack pattern involves luring users via a malicious attachment to click on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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 https://synerhu.ru/uplcv?utm_term=royally+ever+after+online PDF link annotation
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/405b86facfdef486e18eafbf8c9bdf56/gepuzagexiluzewajorafibef.pdfIn PDF document text
    • http://anninhsieuthi.online/upload/files/sevomasunilob.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/filumojixajozu.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/46562486299.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/98552376724.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161417103db8e4---lekukazupegusuvi.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/pafewutalujagesemob.pdfIn PDF document text
    • https://matricula.arendic.cl/files/jutelevukozodofapifa.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137297249972---dularelolexodex.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/28189951961.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-6/20210906063722299419.pdfIn PDF document text
    • http://paradoxine.com/upload/files/19485548972.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/99614378478.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/90802531897.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161403e7530231---tanagasijapivotutoda.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3094e092373d44239e135e69b944c61c/mujewazupudibezaxop.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/39722699225.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/78232463848.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ncauv6158ci1loipgqoqg98st7/64816115092.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/wupukojinujeremopaka.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/67650924406.pdfIn PDF document text
    • http://cga82.com/admin/File/memasatofanekizub.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/tonazuxanebimima.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcfc4878da---kufapumim.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_off0000b3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AE 14440 bytes
SHA-256: 2cfa0c542c81541575aa053abf788b25b95e8fca0acf5de36e755f881c4f04a2
font_01_sfnt_off0000d7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EF 10264 bytes
SHA-256: c24172278df005a6b3325964c1e69833c88ed654df90ccbc9063704fe688449b
font_02_sfnt_off0000ef2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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