Malicious PDF — malware analysis report

Static analysis result for SHA-256 051b5af53bc0866d…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 04:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7055459f6c681807500bf2ee6806d219 SHA-1: 5b44bcfedf3cdec1a4046b8f9945585103ffede3 SHA-256: 051b5af53bc0866d11634bc06e6bbce0f2d9f8190351dbc71214136634831b6b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious destinations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://octvads.site/js/ckfinder/userfiles/files/75038427410.pdf In PDF document text
    • http://gintaras.cz/userfiles/file/22140669943.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/jififidanijalefiveso.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c779166c56c---86578367868.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5cf983e52dc8485c2247d7640d8bf084/fejenoburijirov.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/acb5c1718c4fff79917ab2edc56c0cc1/77262321161.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e433ac2eef042222d77d65b4cd4fc204/91855275202.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f6ddefcbd---xubazozavedato.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/devikenemaboretusip.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160792486e7e46---losokawakaxeva.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/40376854236.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/dutexakodebekidofigikux.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/kuzokumilabilaloregijor.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/72369406041.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d60f6aa23a0---38397412116.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b2afbc5b8d4---12055501290.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/10010e4091d4c36abec431ef91278794/10599600542.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/suxeligasorijip.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e120520059---57086447251.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/24827737846.pdfIn PDF document text
    • https://derfo.info/resimler/files/85219835901.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/45133698203.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/bikiwodabojaxiruzopakezib.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/52449845877.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/0533820301.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa83d3df2---52321766423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=radiation+measuring+instruments+pdfPDF 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_off0000cd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58C 10940 bytes
SHA-256: d2b10a5273eb15c1307daef20d8a2d09dd2f32cfcf0ec802892de0cace5d61da
font_02_sfnt_off0000feab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAB 17356 bytes
SHA-256: c0497e1b2c9aea1f913a4dc99b5558e0bfd49750837a072e1cda3551fd14a8b5

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