Malicious PDF — malware analysis report

Static analysis result for SHA-256 544015f869085724…

MALICIOUS

PDF

85.8 KB Created: 2021-07-17 04:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 623829d9bba6b111909f28419c4200c5 SHA-1: 5e596e86f8394b1c247b91caa7c4187e89d04bbd SHA-256: 544015f8690857244f53f7509571eceeb311e91acacc840e33359c33af51c89c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised WordPress sites, specifically within form upload plugin directories. These links are structured as a link farm, suggesting an attempt to lure users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608357352862d---nimoduvoxuwuzedub.pdf In PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/f1d67229f04bbd2e5307f41e04433e0b/pedagulatalovanadogome.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1762b904aa---suzefiviw.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d07c43c61b5---37911655876.pdfIn PDF document text
    • http://tencanpowder.com/d/files/82650112831.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/b664d0f0ddd82df25c3313038f6ba198/36717170522.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/6n2fbpmvt06hjack7desjpqh0e/kamafawalitaxages.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8fb1f1d20f933fb82d8f86a07b6e0d1d/raboleturavixavetegida.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865b04a7d2a---88786100565.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/tuxiwipenidakabolaledu.pdfIn PDF document text
    • http://alkanboya.com/files/file///92725070355.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/d3e357a513b507ce0618c0afcbc85f22/rujidonifof.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/74353981744.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/96151061270.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3636ab40fa---79542523526.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/85245686019.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/89vkn9vbh0hvfk61e2hmrks0k0/powupuze.pdfIn PDF document text
    • http://yejida.com/userfiles/file/lafat.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/7bf7a9d2567c980f7f31fbe122e5f452/lixefukukosarodexirufo.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/ggct4do2tidhr41vh9ufntf44b/45685328813.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/65341545731.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/12828609368.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/tixukawinexupoda.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfbc3036225---kidikotuxinogix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=this+is+us+emmy+awardsPDF 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_off0000ee71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE71 17060 bytes
SHA-256: e07c9f87cb9180d9df120a28ae73715cfa98eab9d9f874fe619c5f8621cfc6df
font_01_sfnt_off00011a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A61 10408 bytes
SHA-256: 8331458e74cca25739dfa5f75c503e4806298fdfe06105508c78e77015eec9fc
font_02_sfnt_off00013201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1