Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8f49a6ecf311ac…

MALICIOUS

PDF

98.6 KB Created: 2021-10-20 16:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b7f260efd44c44ad61bc27608562e33a SHA-1: 0238f6da2b51d21f91a26f2c54650c8aa2d1d889 SHA-256: 1a8f49a6ecf311acef826bda6769e57f4a0fc3dae7c63f37a236a27acab6a61b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://alirezamirmohammadi.com/images/upload/files/46591466032.pdf In PDF document text
    • https://lawina-radom.pl/files/file/metonamip.pdfIn PDF document text
    • http://video-cycling.de/files/file/vibakivaturumop.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/7799182145.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/2694238379.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/177144990.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/ropararejulipakaselade.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1616f8a2102418---mibidas.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/bawetewigowarepejubew.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021101208232382.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/75918271587.pdfIn PDF document text
    • https://redac.ch/upload/mupulagosujen.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/45270676215.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1615dc8547faff---4565272632.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/gevepego.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1614130cf047e4---xoxufefapumubepobodosobi.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/jivibogi.pdfIn PDF document text
    • https://ebmturonet.progess.com/userfiles/file/81366293042.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/10679737892.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/88522800875.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/xowumanas.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/12b7c8dc2d5bd6023e357f232b7f69d2/20131088322.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/movubugeboriwibujazu.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/fuzobozapoza.pdfIn PDF document text
    • http://househouse.it/userfiles/files/wukegupexajananegime.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/oscUj7J0Gjw/uplcv?utm_term=dead+rising+2+cheat+codes+ps4PDF 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_off0001163d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E54 10948 bytes
SHA-256: 6abe80a5e64f894c2c63934e7f01969d41fa0811382b0886888623792d494935
font_02_sfnt_off0001477c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1477C 19768 bytes
SHA-256: d5f3873e851302d1e45b0b7fa331b8f778c7ecc37bd12663a5797c61750778eb