Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4ba6537dfb5d68…

MALICIOUS

PDF

76.7 KB Created: 2021-09-08 00:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c8471aa1145c7c93839f7879b9fa8ca SHA-1: 57f35c069a8deec04ec2eff80019e86a035b5872 SHA-256: ed4ba6537dfb5d6885787eb51672e486fd5872d5a8eb2cc9e3e0d36d483bbd13
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://mastrodibaglio.it/userfiles/files/kitisudirul.pdf In PDF document text
    • https://ooo-kenk.ru/userfiles/file/68770955235.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/fusigodujixore.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6ea79df1b---norugabulelon.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/zerizod.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/247b6a78b7faf0dbf5708ebf96e4bc0f/nafijegajezogefulapol.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/5c8590f4715471d86206d21adb5d7a7c/safurepiritow.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/83524406775.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160747cb530a51---37133276681.pdfIn PDF document text
    • https://memoservicesrl.it/file/konimagotive.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/lod0349a8mroo7266t1ho9c9pc/8823440986.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/55143755647.pdfIn PDF document text
    • http://nscenter.cn/upload/files/pikosopelezipevenovukop.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/gamas.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/41622192028.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/cb983a52ff561040448e791b9164f54e/fowetulazerujisajakusu.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/muzuneragolativago.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/52661926297.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607beaca23ea7---85252628582.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b7e6c3c20---73751269293.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/19302654761.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/1017579135.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/39262687764.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/62181990767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=apollo+fire+manual+call+pointPDF 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_off0000c526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC526 18452 bytes
SHA-256: b25590ec66762443f4b536f181fe0df8e166971c96443cff0386921e877f5f7a
font_01_sfnt_off0000f542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 10556 bytes
SHA-256: e6026fa09bae8a178069402e26ec2f84273a65c45adfe5db3458370173a24adb
font_02_sfnt_off00010d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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