Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9136186cc1fe48e…

MALICIOUS

PDF

88.7 KB Created: 2021-09-08 06:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d355756f481d97f35b20768d06ae3967 SHA-1: 502778ccb99dd64c1f51a2d00c30759364fa027a SHA-256: e9136186cc1fe48e693f962dd7c12bf38a648e4c9879aa3425f241680ea3425b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The numerous external URLs, many hosted on compromised CMS uploads or disposable domains, strongly suggest a phishing or link-farming campaign. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure to download further payloads or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=czasowniki+nieregularne+angielski+poziom+b2+pdf PDF link annotation
    • http://daiichihr.com/uploads/news_file/dejududajelopetigogi.pdfIn PDF document text
    • http://snft.ro/media/file/45107591069.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/mp5f17jcndusa0rta4t4osrp4g/wusixifisezejojitev.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a121dd4ebbf---zupakavugiwujuninimekama.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731eb8a7dca---93144321812.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/62288216337.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7ee131c42---jenesugofozewiginakovo.pdfIn PDF document text
    • http://signauction.net/userfiles/file/xapalodupiziturifekim.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/46444173709.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608e473f751fb---17481225617.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609830af10343---42695430078.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/7484152580.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/h1n4j1ovrff61pdjflqk5uoiiu/wosuzumodi.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/85209592049.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/tumob.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/42676776600.pdfIn PDF document text
    • https://ghnservizi.com/file/32443374840.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/15958241479.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104bf1c87e74---18994230017.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/ledakimelefijaxosadure.pdfIn PDF document text
    • http://imaginove.eu/data/Files/kibagatobefofu.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ed2d34kpn6qm1q4a8coe8pfoq0/vajewojekivugudababuduma.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bee714b05---sovijeli.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c2c9c3f537179efb54ae39c2c26cf53e/zididemunapi.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_off0000f4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 17692 bytes
SHA-256: 877c4bacdcc707ec924c98271a8444125d1041c9dd662bd07df857240ce38f13
font_01_sfnt_off0001210c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210C 11372 bytes
SHA-256: e460124453caa9f10063fa5892de78c65488082d1c3af03496d426f0cd6d9ba8
font_02_sfnt_off00013b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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