Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b00b522dd64a13…

MALICIOUS

PDF

95.3 KB Created: 2021-07-17 03:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ba582bfe9a1caf1bfc06a52653a9c609 SHA-1: 6849cab4b649ba49ec5a7dbdd7e65fe7f023d970 SHA-256: 56b00b522dd64a131961229357d140b57cb4a686450024f0fca6f0dfa5976aaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nage-z.com/ckfinder/userfiles/files/tolafevujafovesax.pdf In PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/94629923251.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/889ba9098b6aa9449a544804159370b7/panenojawivezu.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/69178608481.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210515/file/16210656851697.pdfIn PDF document text
    • http://ibb-online.ru/f/file/19429460168.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/1726d8c47001931b7c1a4751ab784887/dinunutikozodo.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/jeberarijexakim.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/venizixuxufot.pdfIn PDF document text
    • http://ccspevents.com/clients/24998/File/99435584952.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/a68dee77f3354236d252d7f4498de0b0/21137277388.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021061903254389.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/60169048129.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/hjig7lkjkm1cudo6kbaflmqdcr/dabokowaxebufatogezer.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/zuponajilago.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/wafaxasisuxodelutovemufab.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/ff128006f49589c62acfc3e72692ac7b/67226780189.pdfIn PDF document text
    • http://fructusartis.com/i/File/nebura.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ae1eedb0---58744896262.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160730647f2cf6---buvupugisofubebesun.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/86105015072.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac546a35917---seraretumiponuwuk.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c947613cf01---fisidabubotewuxinu.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/a39le2cm14gs266enf6ub76736/keluxejitisujaluguku.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8d0acc4d6---77341170978.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/0da41ff04fd8a29b9b2806db4d3cf7f3/2087758092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=infographic+style+powerpoint+template+freePDF 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_off00011182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11182 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12999 11080 bytes
SHA-256: 60e67bc739602b604f6e0e7ee749edc1bde4e1dc6532a36f2450a5ab0ed873c9
font_02_sfnt_off00014356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14356 16808 bytes
SHA-256: e8baa101a77f24f81feba12f3967ad9986a8536d56b24bcbaa5bfc0f3aa3d2a6