Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e54b5145cc705a…

MALICIOUS

PDF

96.3 KB Created: 2021-09-03 01:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 921fca0f6f14218a35b0fd8d4bdd4d9d SHA-1: 09fbda086dac122e8148b1451d92675e87232536 SHA-256: f9e54b5145cc705a2070389ac720a4d13d8c094a70831eb35ab13a43ef40086a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous external URIs pointing to compromised WordPress sites and disposable hosting domains. The primary purpose appears to be directing users to malicious content or phishing pages.

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 https://preprodpcb.com/userfiles/files/61460026614.pdf In PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/nj0e5lk4iodjo4tm11teioipvg/mikiza.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/fozatipen.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/61c7d38a98cf9bab697fa8b9349bc0b2/85188719296.pdfIn PDF document text
    • http://fkhd.cz/data/img/mewimenukolidusifesalim.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/4p4pio3v4s6sjf1712c2p94h9n/58836427424.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cfdb351c047---jasidovuwulogit.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/10494434966.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/fegafatumedojegiwomew.pdfIn PDF document text
    • https://mkart.it/uploads/file/84584942788.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/dubusamawivaridudar.pdfIn PDF document text
    • http://belloverde.net/emailer/file/7153286687.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608307a60cab4---21221317125.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/vepukivube.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efc7414a96---goxakukelogaziguxonekik.pdfIn PDF document text
    • https://tavio.ru/files/file/kipaguxul.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7cc64827c345afc4bb1f606ffc37317/menivowimejibexanuwumamos.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f4c999cd373761966eaa514c5ca2b1c9/44411834215.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/08/23/pegixopenujirutevowuvifum.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087efe80fed5---dosukevijezox.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c2665845e968e28257af2122ff958be7/xupikuwanisuxinelirara.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec85bc1967---sofenoxuj.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aac2fe16d1---1573653661.pdfIn PDF document text
    • https://digireg.li/upload/ranolidunulekanatu.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/vibadigifuvumujipomuke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=basic+accounting+concepts+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_off0001129c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB3 10804 bytes
SHA-256: b9712aba48a5323989ae32050168df1142cb258c994762b86035e3bf0eb3ea4b
font_02_sfnt_off00014392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14392 18340 bytes
SHA-256: 38a38c0d68d1c6f01a87460e58bb070bc7cff93b00428cbb9656cbc96b2c8b4c

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