Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f9338052c01ab1…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 21:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0edd7798caa3d4512e8c5d2c4afa815b SHA-1: 6b8fb5e4e8ede17f017f943774f37bff3f47afd9 SHA-256: e7f9338052c01ab1342d325faf2253d0f47ec9b42694ca13a2b37aeb1b8016c8
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised websites or sites hosted on disposable infrastructure, indicating a link farm designed to distribute malicious content or phish users. ClamAV and the ML classifier also flagged this PDF as malicious, supporting its role in a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cameralehiep.com/hinhanh_fckeditor/file/73284650022.pdf In PDF document text
    • http://dostavkaturov.ru/files/file/3694916056.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/26056595196.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114d73052799---54297314466.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/5d17a0337cf0d364c4579680805f3a46/malovov.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/kiwumasogadelefonudiw.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/27811347429.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/lajugofisana.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/s98h5q6nmp7mhc8vdskfgvj2h6/ramifumukudavewele.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/e8bjjib1tp3k87n7925lqh84e1/75159017317.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109031901574680.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1851ed0ec23daebef3f200a0fc58405a/70654299801.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/0c99200229b92cd1c70fb6cdb877549b/vixowatawasurimijimemuxa.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/44894574882.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f2946bdb3f843f63b937d28f2de0e25d/zodupokopumidokodigu.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/8ccd09be45edec0e419c321ef55d425f/30909205105.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/92019566676.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/47562601791.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/98835145510.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/lamolusaxuzaj.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/kirir.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/85264496365.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/fakutozedurazabuvasazuri.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/0lvfh7ncohvttctp8psolgqd97/87753752224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=austerity+the+history+of+a+dangerous+idea+pdf+downloadPDF 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_off0000dbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCF 18264 bytes
SHA-256: 23b35df3bc475734a37bebe1bb08615ec22928f043e4ceabd24483fb60735003
font_01_sfnt_off00010b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B60 11060 bytes
SHA-256: c372c0a5e02dac75292528f26b9983cccd0d18f26cee59df4661ec5e33d60193
font_02_sfnt_off00012500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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