Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbde6dfe154d8502…

MALICIOUS

PDF

86.6 KB Created: 2021-09-18 16:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b74224d2616348c773b94bdd90a975f1 SHA-1: 15db2e4855dd14fd15475be20ca40a89dbf20d99 SHA-256: fbde6dfe154d850262e168a7834cb15335345d0fd2eee09437c7eece24bc4b0a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple external domains, some of which are hosted on compromised WordPress sites. The presence of JavaScript suggests an attempt to execute code, likely for downloading further payloads or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://garglob.ru/uplcv?utm_term=best+makeup+app+android PDF link annotation
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/a2372d66c6342dbf76fe3c08077900cc/zitenaludarelukerimiga.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/4348560557.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109130028556253.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/11957578563.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/74157312257.pdfIn PDF document text
    • https://grandegroup.net/files/varunomuxumefuwikanalunu.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/kutanutiw.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/96e3a19d56ef7ce2cd4a02f1dc84ab5f/zituzatidutinezidimimoj.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161326a03abba5---jezul.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/613e3dcc27c03.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/masinadalur.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-7/20210907181006627352.pdfIn PDF document text
    • https://baglab.pl/galeria/file/fagosuterobagukepunaxemo.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/91420947008.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af89f25315---24746310121.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/20287529593.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/tagogatuvonogurijafoje.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/sosuxixoginid.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/27383970876.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/14284f2f159d052c39bf7531c2c772bf/vifim.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/23474515989.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/64796588136.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109090110193765.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_off0000efb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB0 17068 bytes
SHA-256: 39e9be2f6ca43ae2730ffff15838ca39ebba8829039aac764a732f8d0b22aeb4
font_01_sfnt_off00011bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD8 10752 bytes
SHA-256: 2342eb22ec9d38acda89e6ad37b40955520a1b37f566a72640d7be745ab480aa
font_02_sfnt_off00013492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1