Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1af3c6f39a60ef9…

MALICIOUS

PDF

75.8 KB Created: 2021-09-17 23:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3b3e5534ec0e7999ac91c815b1bbeaf4 SHA-1: 555ae8dec0895772c3357177461f9d03219a4b74 SHA-256: d1af3c6f39a60ef98b09f9ba7f7d5f27b85004c24f6407e53321529e211b3dfd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised websites or disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://4grd.com/cmsimages/file/97041739963.pdf In PDF document text
    • http://slovoveri.org/userfiles/34116509457.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090310525073499.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/suxop.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612f80c262639---miroboxuximoj.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/69004172308.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/monogusumikuwe.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/2971c94b130a11d1c2c77f2fb0789f3f/49545922413.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/fidovopobogosazeti.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/vikinezitikajavas.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/21292546666.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/nazanufixivejosubiropuxa.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210905111410_396626064.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613615e34248e---93008228492.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/40325009208.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/31320598120.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/69308816486.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/11324084180.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/lelowib.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/96273207062.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/77919243773.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133460fb48ba---4354102252.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/wunokiwivakowavore.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/kujimivokenowoxukul.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/44616743710.pdfIn PDF document text
    • https://granitnet.hu/editor_up/6150588296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+get+1000+robuxPDF 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_off0000c6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF02 16876 bytes
SHA-256: ecf1618b5173e12fb59baff035b959b74c0d17ce42cddb50a1b1df4864ac78cc
font_02_sfnt_off00010aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA5 10304 bytes
SHA-256: 4d6dc9ac7be2f5f1c9e1fa1b022be423b6af2c1782b7f8772afa35afe41727ed