Malicious PDF — malware analysis report

Static analysis result for SHA-256 adfcb2a95da2f7e1…

MALICIOUS

PDF

75.3 KB Created: 2021-09-03 00:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cd5219eb0c8aa7e84f701ee9ee252e52 SHA-1: 8272333745df52678b83c09fd8f7b2e35ac861d8 SHA-256: adfcb2a95da2f7e16d5d47e9b96c714ec3b7101ec7e90ade0096aed089333715
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. The heuristics indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The embedded JavaScript likely facilitates the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=how+to+combine+multiple+pdfs+into+one+mac PDF link annotation
    • https://visualmotion.nl/uploads/file/dolusib.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/ee3dd000edb154298e60e4f9dae8bd13/75365514188.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/16516973512.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/jatobejapajesapebuwaji.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2d24da60660eee98f00b8e40421a9348/93572625346.pdfIn PDF document text
    • https://schmitz.cz/res/file/feluj.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/vawujeri.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3bc24b7355---86092530559.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/79665285343.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9f586c4ad---gukevakelovuwunupal.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16199811935572.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210701155811.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/l2uo65tl2aqkqmm4b28dn61u3c/79849945850.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/10880784249.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/27271768493.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/4a8454b6f42782cd618092cf69b7eb45/94163192880.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/031c66775c04b310c7622a43eea10922/87117603201.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pujewugeta.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4319add7d6---fanegakepodogidiwu.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/57344324606.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/21201984687.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/xoxenovajub.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e7ddba640e---42455538196.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_off0000c244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC244 10996 bytes
SHA-256: dd59e75be88d972d4c471c112d11ad940b9ba1ce5c2277b32021f06d7f38e865
font_01_sfnt_off0000db98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB98 17136 bytes
SHA-256: 80806d440b483fb687a5ad5c25668964ff2f881ccb419ef0e7a6b0b6106ca90a
font_02_sfnt_off000107b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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