Malicious PDF — malware analysis report

Static analysis result for SHA-256 918f397723bff648…

MALICIOUS

PDF

69.7 KB Created: 2021-10-02 16:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 857c4d98063f5f4ef30dc8c4e06f838d SHA-1: 3f10e960b24fd8668bebcf1839244ce10b84367d SHA-256: 918f397723bff648e687b85de484ce2048a24b344de94aaa783bef9c3d97060d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple disposable hosting sites, a common tactic for phishing or distributing further malware. The presence of external URIs and the overall structure suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://lafenicealcamo.it/userfiles/files/44902996937.pdf In PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/0jccv232509i17tcs1b5ccrvbs/nusuvekiz.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/ca924592b6b9c52510a12e293def41ab/61900886299.pdfIn PDF document text
    • https://musluogluotomotiv.com/upload/ckfinder/files/detodipusokapoluvu.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/84917070594.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109110944497928.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/niviwezulubix.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/52121479005.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/bizatejom.pdfIn PDF document text
    • http://aweibel.com/Photo/file/fudofivifanizuw.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614df32a0093b---vezifivezumaro.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/debavosawonosuzopazero.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a38ce2c1dc905c69bf7cf3f6721aeddf/18005986997.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/wezukexusoduxu.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/kuvemigif.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/wupiserewugakegeb.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/tepirozafibogalom.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/88948538484.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/dolisulupofokoto.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/goziwit.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/72314476834.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/selebalamurofitefapudawus.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/74812186326.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/73327912444.pdfIn PDF document text
    • http://leton.pl/userfiles/file/fatax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=modals+to+express+degrees+of+certaintyPDF 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_off0000b13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC952 11004 bytes
SHA-256: 7ec38aea85b897956f081dfd49225efd77804f479bc3a3fd8db5ab9fb64e022d
font_02_sfnt_off0000e2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D6 15344 bytes
SHA-256: 9bd7f61b033532398e541e5da30b6ae5392833ef12edec30e5800e7b3e403490