Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f18f8b5597b693…

MALICIOUS

PDF

83.2 KB Created: 2021-08-15 09:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d206f1188fc70bed17ec35754341c367 SHA-1: 10823e0cd65fb10b2579afdd8fc86093f1424b92 SHA-256: b1f18f8b5597b6936b49f42fc533c00fadb24032558cc139d6d3cee24652c3d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, a common technique for initiating malicious actions. Heuristics indicate it's a link farm pointing to compromised WordPress sites, likely serving as a distribution point for further payloads or phishing content. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript likely responsible for redirecting users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b185d80254c---5343992717.pdf In PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5aefacd4f797ace99f61bbbf644364a8/nijimiposozokexigubepubew.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210731_179C9B093649E515.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/fa4plsg8sn5rbq29an5a25e7og/kurixapapefuw.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/7gv7b5ne7qnav8e54kuhd1cva1/rigutosatafimajafusobotod.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/72679573337.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d60572cba7e---83306260894.pdfIn PDF document text
    • https://technische-dokumentation-hoffmann.com/upload/files/maxixopezopuwuwetupuf.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/magibizivozele.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54b18d44bc---65538603719.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870ec37f1ce---bamamig.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b60fd7f42---30913286640.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161008c1515a94---fepoxulekip.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082dbf8c9b27---39862675937.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/dixutib.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/60589165228.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/138f0fa5bb9155da3f415b73a4e670ac/73862474420.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/zodik.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/b9f77dd24b37798c90488a0de21aad48/99006204403.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16094498c55084---bunopugoresolosus.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/77961715243.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16109ce2e4614c---zoxojiseroto.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/84923345213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=hebrew+bible+pdf+in+englishPDF 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_off0000e3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E7 10616 bytes
SHA-256: 1f4353cbf6e980bc6c3bfda57684aa31845e49d72dfcafcdaf6796beae64a75c
font_01_sfnt_off0000fb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AB 17100 bytes
SHA-256: 588898e2f64aab68d706481593f889ce6d40a29852c5b8a5fa01ddeaad97442c

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