Malicious PDF — malware analysis report

Static analysis result for SHA-256 2657c8bdf1d5dd2d…

MALICIOUS

PDF

83.5 KB Created: 2021-09-03 22:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c2bca2e17307c68d88a3e65b4c129d06 SHA-1: a1d95bdd82bed86f40670561bcc4afcbb4acf27e SHA-256: 2657c8bdf1d5dd2d519fd331e2324f74000344c063d231b565d9e910c322b864
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Several heuristics indicate this PDF is part of a link farm hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://n-zvuk.ru/upload/file/63570721151.pdf In PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/61099059601.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/18888392142.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/5f0bfa4059b1d1fa449a05e1bfd5e06a/jewumomusupod.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d83c54548---86823470584.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/r3lg751k44vvqb8d9k354t5iit/kuxusoropud.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/kajoxunofubisux.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/f6872dc7afe064722125ec73728669f4/govevirufolebotu.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/61375921419.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/7e26c4eefdd240244be6b687ff0de284/jafuziseveva.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d5c82072---soridufatimugoxowakulufi.pdfIn PDF document text
    • https://netpage.info/userfiles/file/devaziroperuzekeg.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/f32000b8f0823210c2b690e6c1d4315b/14825048843.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/9295a4f5459fa4abd4795f0ce3f0a207/31998664726.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/gegodudefen.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/35335554857.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/gasojipedibepitulopuf.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/tar8scsnrkohm95a8qlp0ia1jn/76727907917.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/navujotupukesawez.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/visefakavirapif.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/s6n04795b29mrjft720o5tvq03/82503516212.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/38400967124.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/ae0d1c40c1f9d0744a7f004e5685ccd4/fabapuvu.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/dupogegenoradesarasegumex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=choice+theory+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE371 17612 bytes
SHA-256: 480f5add2774f3b4f81efe1a192d4d718facdd8bb14e58ea9cb5439fd99635e6
font_01_sfnt_off000110f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001290f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290F 10384 bytes
SHA-256: 736ebba704b998f67ddf76261a6ab450785b6053aea2711a168f2f490f804d07

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