Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c1311410a4cf79…

MALICIOUS

PDF

89.4 KB Created: 2021-06-27 09:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 42b6b6cf081ce0c5e6db9dea37d90ccb SHA-1: 22cfbf7fd791aa8fc848176b594eb2be8379a002 SHA-256: e9c1311410a4cf79b153078e62ef95f45dcbd86414feba555c301eb996247ef6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data

The PDF was flagged by ML classifiers and ClamAV as malicious, with specific heuristics indicating it's a credential harvesting lure. The document likely aims to trick users into providing sensitive information, such as one-time codes or MFA approvals, by impersonating a legitimate verification process. Several URLs point to compromised WordPress sites and disposable hosting, suggesting a phishing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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
  • 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.
  • 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://allaboutdowney.com/userimages/78689136737.pdf In PDF document text
    • https://invest.pl/userfiles/file/godofiwevuget.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/71459329685.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/78144130231.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ce2eab76d---77495175366.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/96265387204.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/42afaaa39ae8f092f6565104c010ae11/sopofogizegidetiso.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607417f898ec2---wolovatubalotop.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160883833f1914---seguwaxog.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/4v3dg3na23gp1vdfvoh7bc2tl4/jemuligijit.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/84199329547.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/ximosefuzifepadali.pdfIn PDF document text
    • http://amdind.com/userfiles/file/49033033961.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b9836dbe5---tufawanenuvokodilupe.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85e426a899---82595018338.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b5e94f9a2---85438443627.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/af4b6d5fbf2d3477ed9dc601d201f636/venawuvovuzefagatijodaro.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897b13cd72d---bupogazinaviwoxonofu.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/vevipepadamivufuxap.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/lejerizi.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/0a026ec163437a399d88a10827b88b46/nixulevisokogamunomovemus.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4d4233d25---80539263103.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/ef4425b21ec906d51b97486ce31a632d/21272755575.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2a239e8e9---diwebatidifoguguwatuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ad%26d+2nd+edition+character+sheet+pdf+fillablePDF 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_off000102d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 16524 bytes
SHA-256: 7fa5c808c7a2f2da87e21146e291f025a7a88afc44474d5cbaa16908bf410abd
font_01_sfnt_off00012db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB1 9192 bytes
SHA-256: cec472d94eb3fdb0df358ebc6477a54accfbb063ec4a1f62a798cb8c4131dde5
font_02_sfnt_off000140e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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