Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c1dab2c55137a6…

MALICIOUS

PDF

88.3 KB Created: 2021-09-20 16:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9fe43fe699afe8b1754cd24b622f9e3e SHA-1: 02a8abd4f675f41e57bad8cd7f984e984951f349 SHA-256: e7c1dab2c55137a6b0270c3dd52d5500f2c6969eec2f8aeaee1583a03aad0dbd
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or credential harvesting attempt. The document body is heavily obfuscated, but heuristics indicate it contains a link farm and lures related to account access issues and MFA, suggesting an attempt to trick users into providing sensitive information. The presence of multiple external URLs, some hosted on compromised CMS platforms, further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://krisoc.ru/uplcv?utm_term=unable+to+access+hotmail+account PDF link annotation
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/lilonabikajabesusasenew.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/40985169735.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/gegedesozijosotofe.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/94261511527.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/57088613282.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/dopofifulojub.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/fabizipuxajimos.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/rokiwewesojug.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/83143864224.pdfIn PDF document text
    • http://4bx.pl/public/file/28229329359.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/92391363117.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/3aa6c6816f050c76f780e50e8e65be1e/dutizojugugeworogukupuvom.pdfIn PDF document text
    • https://linardi.ru/files/file/27937293194.pdfIn PDF document text
    • http://jin16888.com/userfiles/file/gixidubonose.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/banozerudubivufajojonaj.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/votusokevedewopubedukaz.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130355c4ae19---pefumofisisidalavuzedobi.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143d1087d532---suginobemebawexabejew.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/wutuxogoxave.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/72658125599.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/geragosesufobezobo.pdfIn PDF document text
    • https://cncunse.com/d/files/87299191865.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/torit.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/73047427952.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/julivuz.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_off0000f407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 10644 bytes
SHA-256: a82e09a9d1ba66680c1369ee4817a5de7b096349a5d22c31cfffb0f86733c51b
font_01_sfnt_off00010c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C35 18808 bytes
SHA-256: 3f1d3b57fea1bb977bd0e506204a82f8dea93715c14ca887bc0d1a5b0ad19fc9
font_02_sfnt_off00013bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.