Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9fdcb73f0c7329c…

MALICIOUS

PDF

103.5 KB Created: 2021-07-27 01:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7309659598bd400b70c0cfda9dace333 SHA-1: 64120d8429d59f6833aa14c22d9b210ce46a5ebf SHA-256: f9fdcb73f0c7329c2a53e2ab7f0a43be20e929f82a9e1c62112e5e2711590827
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the PDF structure and URL patterns indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/rafubewipi.pdf In PDF document text
    • http://yuha.be/_files/file/58113682794.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b9e1b7423---roziw.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af40e05ec1---jalekunu.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/kopanubelenuxisoke.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/wadamidave.pdfIn PDF document text
    • https://ridersshop.it/file/96985984366.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/getevawukegegeveloto.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4de1572ef8---banarizawisovofekaj.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160beb2a240e23---74045890105.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/jodadebagijifewi.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/tusovojujulupamigadovu.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/33763500d82800a451be65d649b2e2c0/fesixusakuwe.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/50b266a7971b5a64b7faf65ef5541bf3/21049002682.pdfIn PDF document text
    • https://bonacorsi.it/file/63897415685.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c09bc4396b---rafimuxofaduwizopawor.pdfIn PDF document text
    • https://aedwea.com/upload/foto/50377019053.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/61183285576.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609158455fcfa---mavolokozupig.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6449c20a0a---palab.pdfIn PDF document text
    • http://agrion.org/upload/fichier/goroxugobofesetamufitulib.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/c5b3603e9a7f6c7a7448fba978e535dc/rozewuluwinag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=singapore+math+grade+7+workbook+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_off00012b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B46 11176 bytes
SHA-256: ea65cd8b7966a99c490b98714a54b21dc99068c491a9731c7337c115beb20a49
font_01_sfnt_off000144ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144EA 18328 bytes
SHA-256: f020e039b79dbfb5777c6bd59a128ee6d8f23dad3a71a8452400e19407222d05
font_02_sfnt_off00017595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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