Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b7ac38542bc58d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 03:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 336eeff60f6f3a2776ccefc7439e3f84 SHA-1: 02dbc44bfec304c7f8acb7062f1b06ed00bb7711 SHA-256: e0b7ac38542bc58df7fbb20124d11e7d950ace13598a24e286e4435e7f919309
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggests a link farm designed to redirect users to malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is likely intended to deceive users into taking an action, such as downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • 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://archism.ru/uplcv?utm_term=nagaland+university+ba+english+syllabus+pdf PDF link annotation
    • http://biemmecommerciale.eu/userfiles/files/45295950127.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/8bcf62fc29b825d5aea4c20833716735/67003154034.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757155613f1---78223951063.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/qenpqtd9c547opmupfi22gbmbm/88429770394.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/busawilivarubizikirip.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/65035963721.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/nidubesorabod.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608860e19ed5d---gokeb.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/lalosudemigeloxigulu.pdfIn PDF document text
    • https://tcremich.lu/files/files/53188577754.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d31769af72c---lovat.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d30e3a42a9---mudesawolijugajovan.pdfIn PDF document text
    • http://poultech.net/d/files/99596502617.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/b9ous9t0ls75erj7ouqn6366ab/24382007899.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a152cfd025e---88726818862.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/98084087518.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/d784cbd430c53c3e9ef09686320057e5/jowofo.pdfIn PDF document text
    • http://elitvorota.ru/f/file/10114919898.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/nsgm8rmn7es4hji9tahf9r0hqa/zitekawuxut.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/fixosuguvadiresonutosomi.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/14052d50dd53e534819e47a4be43c574/4721093253.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/xevinovovipowolazujap.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608641ffca261---23533364843.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_off0000d7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BD 17408 bytes
SHA-256: fa9592b97f21e1e2322ca5aa494903aee28a134f5eb9d257757f0cbad92b52a3
font_01_sfnt_off00010521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D38 11056 bytes
SHA-256: ccc0c1cc430710bc35395cecb8f1d37a7527bfe87f89d42477216f90fe7b3d41

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