Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb1af18e799257b…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 17:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f0d1c953b2432b6ad8d25cffcefa05de SHA-1: b9d95d0ee6f6e7ab5e91a154689bf16d85fc5f3d SHA-256: fdb1af18e799257bb06d3191aace70e122bb9c18203d1132f45663c0a8f5b8ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ct3rue6huhn6rtps2ogqhlpq4i/diwalosojugafose.pdf In PDF document text
    • https://karlschool.org/uploads/files/202108212211098560.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/d6daaa4df69b378dde4bc2e8ab97bfe5/jilobomoduvuxorit.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/41682556014.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/pidutetetopi.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/wamogopimu.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/jibutodenofojugi.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/43348234412.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/1319034cd6bc1e657e0e1cf34c3662ee/77758380392.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160db4124007fd---nagelo.pdfIn PDF document text
    • https://ksuskalology.com/images/file/sumalipodarizi.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/lebulufojower.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/13m6jcv56ce95fjkk21iarh1du/wubiwesibufe.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/47870255850.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608118867e7d8---tosemeduwur.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/kumoxubaned.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/86148092129.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/jiwejilaromogujizuk.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607efd1977faa---musaxutiwijulepura.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/35843185703.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612929ba507eb---89841196843.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/fatubovo.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/zojagukumetetimokok.pdfIn PDF document text
    • http://cmepta.com/clients/7/74/74ea2f63c40943e6497cbf70acaf7c81/File/95012575020.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98676783974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pdf+expert+mac+convert+to+wordPDF 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_off0000dcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FE 17320 bytes
SHA-256: 0bff48c3959d3e8a49d2c0aa522f09d2b18cac97b8a54b9aacce321ace726b51
font_02_sfnt_off00012258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12258 10728 bytes
SHA-256: 0f3640cdf20011716ca25f7372bc47f3ca799e1552b0e92011c64204c409761e

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