Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b61a749e7120da…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 03:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 17a26ae933eeba106c47d2c97c4cd6cf SHA-1: a9efe616550003d6238d0631b4d8d77e08a6582c SHA-256: 43b61a749e7120da8761d7fa351ed81cbd38da6290baacfc371310bb3d8453a2
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://srihemkuntschoolint.com/slbdavbatala/userfiles/file/83350050341.pdf In PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/e80c52b2f4185c914fe9a064119d8437/jobavoninugoditeb.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/27960814367.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/7jbr5he8t9ko4osn8fqflhp969/geloniza.pdfIn PDF document text
    • http://cascad-trans.ru/files/79016549901.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210720_3A6F31A2FB8577A3.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/13705478127.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110cfd20f7f3---fufuxitunidedulewixoxu.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/32309167647.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/36702031535.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/94065514563.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/10a017d0960165478cabc0f427f051b7/xixezepapamaki.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/21547034449.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/17324241516.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/qds7bjesms1dm19fk7du2gogb3/siguz.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731466019b1---sogaburogagifulowegiwisom.pdfIn PDF document text
    • http://fructusartis.com/i/File/tawikubawifulaz.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/31da2ece85fbf51014347cab11924fa8/zevesiroratezeguzal.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/e060add7be9640a3fe5ec0301ef6ada7/14057987937.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160763d5cbfce2---kametiluwidekikorebam.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/6d20d1c83c7a7323bf8d0926217d43cd/pekoliwuboloxobaxeneg.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/daburefegil.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b224d127b8---lijusazaj.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/balusajivonojoruzev.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7a5c3e046---kijavosawara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=yearly+planner+2020+pdfPDF 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_off0000dbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CE 10352 bytes
SHA-256: ffb39f831323947c0b7371ae28db4de755fb68cdc896ff9a1d73f0ee9ff90634
font_02_sfnt_off00010b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B54 17304 bytes
SHA-256: 73013cb3fe7072b5f82f5d9f99059d02d951a02e117cfa67560a84a7969a07fc

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