Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c3f724a46cce68…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 04:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e784de10395c52f444cc1fdc1e3fea85 SHA-1: b40cf2e9267f74637302e9586c05ca5d932a5ae2 SHA-256: a7c3f724a46cce68a41acf8ff4d28e10adec9b57ec70eb6f0a487c1b6041ff8e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting it functions as a link farm to distribute phishing content or malware. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=video+special+effects+app+for+android PDF link annotation
    • http://gazduire-domeniu.com/UserFiles/file/79246904306.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71123257640.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/61136218686.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140a4e3b925b---18893892280.pdfIn PDF document text
    • http://storemisr.com/uploads/files/memex.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcf15e2a87---sugos.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/41412889377.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///lixomalonu.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/zoxifunikov.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/bitasepox.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/mujaveregi.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/55955936257.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d341c2aad---tepinarawubudisewidavetok.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/50863278983.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef0d216294---47265108250.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/rusawavanumepuminotawisu.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/729870759.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/65218085507.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/47999781957.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613316e51277d---panerelenibipakumezete.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/mifodoxagexik.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/89098259463.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/gejerazijavop.pdfIn PDF document text
    • 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_off0000d6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F5 10584 bytes
SHA-256: c36d909b7c882e822af82b182c903847217f43a57a267f867df32210eda4e8e5
font_01_sfnt_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 16968 bytes
SHA-256: 62af198564cc8fb79a5245cc2a1d7e23d6f1b10573203192a84bfec8a1c2fb32
font_02_sfnt_off00011b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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