Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6aca688f0ebbd14…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 05:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d6bc857881b1b1cfb391b2342e82bd18 SHA-1: c8b4be99af23992e3357369cff37ac4ea7c5f0ca SHA-256: d6aca688f0ebbd14d22c41f5fc81c7740107b4706087d9c87be852b12e6e0c49
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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://immobiliareincentro.it/allegati/file/xutajesavodetomobewalezo.pdf In PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/9709e624a9d9acbbdcfa8bad82a4e026/vosaxozozufujosoxuv.pdfIn PDF document text
    • https://anfauglir.com/images/file/24177326979.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/didezoludun.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/piduxajuwotofud.pdfIn PDF document text
    • https://deepex.hu/hirek/files/48788629647.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/xokuxovanezupevepivoturo.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/56d03f305a1849cbbc9f42f5085c6f6c/832657163.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/90954117301.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161357ccc6483f---musijapopakofuzelibiger.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/depijepawuwoguvalotit.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210904_124342.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/gimuzosimow.pdfIn PDF document text
    • http://www.ghidmariaj.ro/app/webroot/files/ckfinder/userfiles/files/30576046826.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/xanavopitekikepaweweg.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/58017421941.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/fepuxeda.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/mefixikun.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/29064422161.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/sususadetu.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/20271309624.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/97363544178.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/pifepukibomi.pdfIn PDF document text
    • https://ivanamihic.com/files/dajub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=what+is+fastbootPDF 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_off0000de57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE57 10060 bytes
SHA-256: fc7aad5715c6696a7e6b1503d677b055bea468777270ffbc3c409c78dede3275
font_01_sfnt_off0000f4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E3 18076 bytes
SHA-256: 47ffcb0973c2f9aa6104bde19809b1ffc144f2d420553055fa79419c99df0af3
font_02_sfnt_off0001232c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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