Malicious PDF — malware analysis report

Static analysis result for SHA-256 6576cc34658237c4…

MALICIOUS

PDF

96.7 KB Created: 2021-08-14 03:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5c1c1c56380a2a2158548456a1e6a843 SHA-1: 165acdd92e9e2d002113a777c463c7eb29ead3a9 SHA-256: 6576cc34658237c4b59d94b618211031ca5734bb1dc2720558cd2875af276772
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=to+kill+a+mockingbird+movie+jem+actor PDF link annotation
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/de2700b8ae0db4bd838b603371754130/57841845579.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/45468161185.pdfIn PDF document text
    • https://hgb.se/filer/file/24639827230.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/renut.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c539485cd72---68129569705.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/20233487072.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/11d481e0d4817f6d1e307f8b5918f68e/xisivibobatedugul.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/20633483798.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfecb026cd---67931277326.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/ginixugevokofo.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/musetitazot.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096476d6be9d---58081119561.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/47598227628.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/4b78f135fe94ae03b7ff3c1c38a5e63c/bogosomix.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/d2b246340a00ef679f1aa95d5a6e59b5/newojaxonuvolagajesegoro.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/64667338970.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ffefa429cb---repadufit.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/3rcu6mpb1boarmlp4rv1ag3k8b/30015103910.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e66e3b602e---16380520668.pdfIn PDF document text
    • https://grandegroup.net/files/64983534944.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/cdf76eb5157fcd41b1a34571c4a89086/legusowakik.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/kedikebojejebirabupejag.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607791bd8f522---15801611800.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/35218816668.pdfIn PDF document text
    • 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_off000115be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD5 10936 bytes
SHA-256: ece8741d3f4acbf7c1d23bf5bdb616e6cf88440a0066025d012f905fe8e0c5e0
font_02_sfnt_off000146f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F4 17512 bytes
SHA-256: 62d76d2d6d5aaebb42f6e467d5a5e728413084fc196f99dd441b64e79fd9697e

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