Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7d4a4dc7211042…

MALICIOUS

PDF

81.8 KB Created: 2021-08-23 18:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9ece26aa5308e8e6c48a8c6fff8835ff SHA-1: 88a25e4fba0ffda74fe9958ee5d70fc766584c15 SHA-256: 9c7d4a4dc72110421731de508f09baa9b1070b34da94dcc94cc6ffe02ad295bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of external URIs and link farms on potentially compromised infrastructure indicates a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/56e83a366a195a7cbd3f34132342199f/50551202400.pdf In PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/u1lhlv6in0h6je9b6nqermg4uf/gonukulikajuxuxodefeguvu.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c91882629cfcd7424b280b71d0c2ee9d/pofifurivasidat.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/42933708414.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/genofegoduje.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160853b5943189---27444322585.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/q36b4cka4vpf8g8vb43vfi9jbb/92146431488.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ehro1ke7s5h7e67em9hqq4i7f3/bofusenarasoxuwulabovij.pdfIn PDF document text
    • https://wittnebel.dk/file/doxoxobupabedevekaro.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/63130153090.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c12a0b7526f---mawek.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/81737018260.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/92567588642.pdfIn PDF document text
    • http://zcapitalcrm.com/app/webroot/uploads/files/875136334.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160820d2aad788---mawukewaxunujepigujiba.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160753570dde6e---fefen.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/vovagalumupazegemaledum.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/50240556958.pdfIn PDF document text
    • https://intellicapital.in/ckfinder/userfiles/files/55827432347.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/2918307ca7052e2fa4f874997a346c2a/23331982665.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/butvenom82eqk2ce9kmav4d6v0/36843550394.pdfIn PDF document text
    • http://atonoserver.com/userfiles/file/47217941652.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/71730888204.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/dfe0b7cff5faa903116affb5a14616f2/98044606888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=19.5+inches+to+cmPDF 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_off0000de7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7A 16716 bytes
SHA-256: 3b8ed00d3fba829049eae3d4c825345400cc03e00b7a6daa4959afb693d2de4c
font_01_sfnt_off000109e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E1 10508 bytes
SHA-256: e6ec9b899b3520991c04d2665de132be7724d448022500789b18bf815b68c553
font_02_sfnt_off000121af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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