Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e156effcf44596…

MALICIOUS

PDF

89.8 KB Created: 2021-07-02 23:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cf44383ca48d6dff2dbf342fb24bcd8c SHA-1: ea4db6770d100e195fb3544938d91d14730be8a9 SHA-256: 50e156effcf44596a0f9652bc299cdbc5ef7e5fa8f0bbc63ff1242f1d771fd3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/da3ec452ca23004cb1d600bd1b626ba0/55067486566.pdf In PDF document text
    • http://morgancountyoh.com/userimages/10951168014.pdfIn PDF document text
    • http://emurus.jp/userfiles/file/roxumepiner.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608046fa6dab4---mexefobajojava.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/12782275098.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160badda2b48e2---sedexuvatifere.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/mozuzugedajivibum.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/sawerek.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/21742950739.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/9d2dd89a9ea1bb12140d1494bbd9b17f/34427068172.pdfIn PDF document text
    • https://healthcareadvisorsgroup.com/wp-content/plugins/super-forms/uploads/php/files/ohpnvopuekoh2u0namknd4ojk5/palepamikidurenezezulo.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160805db8a59ad---30649679745.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/26e02cc6e076e8d0836a57e746c990d3/xabivajivofipoxegi.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/5154097698.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/latasurunojufeg.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf2487d57a---rikofiwanimepodametefe.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/64a9j9cl9smoftq8qll8voh5tj/tikufanitibe.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/f4qleb7mtsbejsdg45rrtr4uv7/wutular.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096939d32e23---melapakogufisozopu.pdfIn PDF document text
    • http://malifer.hu/upload/file/47883989479.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982218e0bd9---kalusowexabogixotuniz.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d632624b8---11720741216.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/83834792289.pdfIn PDF document text
    • http://abpaluso.com/upload/file/dowesizexu.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/83986567035.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/40622484644.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/45acc0af76eaa24f28c15e906d20513f/7937551732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=i+miss+you+re+sweet+heartPDF 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_off0000fede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDE 10472 bytes
SHA-256: dcdb7c77572741634c84a348c7cd2f1e5a507068aee5b13f6b048cdb88ab335d
font_01_sfnt_off000116c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C6 16912 bytes
SHA-256: 05ed769292f240d0a579f4d842631208a972e373990eb091d2a1f08d4fc914df
font_02_sfnt_off00014177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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