Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b5bf0c5bcb5c65…

MALICIOUS

PDF

88.0 KB Created: 2021-09-10 14:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fe8f3f3b27eea54d16c33030934b7af5 SHA-1: ee26a9da6a5fd70ca2843aca9bf70d6e9e91e3c5 SHA-256: c2b5bf0c5bcb5c6500a550fd7861af9df779ae5ad1a12f314b36c51e19d121e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Multiple heuristics indicate the PDF is part of a link farm, with several URLs pointing to compromised websites or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://moutierrozeille.fr/userfiles/file/samaniji.pdf In PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nenolifexex.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/vapivakimefanilaxabolemev.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/30880775550.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/wakakaxilenodulojajukediz.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/latusazedigotiwad.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/43772376576.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/16202701564.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/zodumuzapozesutanarap.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/tanakej.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/kilomibuwo.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/75255218541.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nivasizolazofevurug.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393774929f4---71914902202.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/72033000996.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399628c38f6---39937153020.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/20062751132.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/41878981561.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/sefikujuve.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/kidemujegekezew.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/87779949049.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1ebbb3685.pdfIn PDF document text
    • http://sanruouvang.net/images/uploaded/file/77947929224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=child%27s+play+full+movie+2019+onlinePDF 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_off0000f0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DA 18020 bytes
SHA-256: 12bdbc57662489821e06e0fed038081d052c7175dc070ec3fd2cdb68e1b0b9d2
font_01_sfnt_off00011fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA4 11372 bytes
SHA-256: ad2c087741fdc0347a14f125bc1ead7d647767991b31dfc21573a52dcfdba121
font_02_sfnt_off00013a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1