Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a74f9495b750a7…

MALICIOUS

PDF

87.9 KB Created: 2021-07-06 00:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 45f6937c2e498aa86d815517b9b0967e SHA-1: bb4b0cf337e713bd9a34d745421227a1974aa8ef SHA-256: 19a74f9495b750a7d5a6c2b704cb57973cf664c60958d818600a877d779dcb69
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan delivery attempt. The document's content and heuristics suggest it lures the user into interacting with a remote-support tool, likely to gain unauthorized access. Numerous URLs pointing to compromised CMS uploads and disposable hosting were extracted, suggesting a distribution infrastructure for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/qt8bl33a8mq3m8j0ph80j5hss3/gakolezosal.pdf In PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/6kqk3vl4me03m5akg3q4apobf6/68157778960.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8b4734740---jisodulamaxamadinupive.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/9l20i20nvne7v6ogn8j0jdqja2/nifolomemokiza.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/felimitet.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/gevagizujoguwinujulogigin.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a55bd3738e1---jalijuzisewo.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nexara.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9a7a0607f---20553156765.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/sokopozewipobi.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32f53b447---zimilasevawo.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/67eo3mp6q9ferd5u7qbbo11n5d/67576611254.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/38926855022.pdfIn PDF document text
    • https://5udua.com/contents//files/98540333626.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/252f5um3dk5d9nrstkknqa2hi0/zovobujuvig.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/ddc96103985332b314fb2ca1aa371711/61684442261.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/jegojijabejiguxevedobemil.pdfIn PDF document text
    • http://aroma--style.net/files/files/madurebe.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/33703615056.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1241ab0ce1---furasujon.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073784243a2b---vezonobopexufitatimate.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/natukomojalulujijaribixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=painful+lump+on+finger+jointPDF 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_off0000f745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 10764 bytes
SHA-256: d84d1aed1a1df11b8987788ee29e2b3eec489099455a9dc3ec5fc36c5ee3fac2
font_01_sfnt_off00010ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF0 16548 bytes
SHA-256: 82f3af2fe94fc1c994bf548a8eb4199ff0e654fd1790e21d19630704e2e9dd7e
font_02_sfnt_off00013aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1