Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e11e1badf54951b…

MALICIOUS

PDF

84.2 KB Created: 2021-07-31 11:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 673c1918e6933c19489eceed2bab375c SHA-1: f1da947cea6830f4b5acb3063a73c3086d97a426 SHA-256: 8e11e1badf54951b6d13c204e5c87ff82a1188cf78c606281c9f51702316c77b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The presence of external URIs and the nature of the heuristics suggest an attempt to lead the user to a malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 6

  • 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.
  • 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://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a132c7bd615---75411178705.pdf In PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/64589707496.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/741e0tbrks8ok96li2pbbd9lj6/77969402761.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b22972476---gajobitakifusavegodip.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/26836002014.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/tisesozubuxegixiforipelin.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/10046990942.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16fe00ae3b---menitudurukaka.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/jsfcurfllnv8gu1dorqudh4i4n/josaravelaf.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16235841541697.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d77a7fda08c---mozobuluzuzer.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/7fc8072bf35627bb20451144e74eaaca/bonakidipewufaroxerab.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/towif.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/334732b3217bf2c5a2cda0f2617e4683/93576296707.pdfIn PDF document text
    • http://guowangcable.com/d/files/pojukitubamanoxanosewen.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8992d6b0be---bazajutinixudesuxurededej.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/7445367327.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/bukanodagagu.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fb0b6e82b---puzirudago.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/xuzabax.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/zojaserotadeduxi.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/55954703134.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/96364979123.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/pojusako.pdfIn PDF document text
    • https://topupdana.com/contents//files/fosev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=tadabbur+e+quran+complete+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off000127c1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x127C1 16776 bytes
SHA-256: 90e8906d22d5789e9192090958a448af3d7cc36f3ddcffd73183a269dfdc7296
font_00_sfnt_off0000cbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB8 10872 bytes
SHA-256: 4d7c6ae4fd57f4770aeaf357384063dae63b0893ffbddca3ead12aee85302619
font_01_sfnt_off0000e459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE459 16932 bytes
SHA-256: 0809e8c62ea7080b2d9a931f0474e0c4c73254283fae378973f56cbdadcf80ac
font_02_sfnt_off00010fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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