Malicious PDF — malware analysis report

Static analysis result for SHA-256 7405742c8f5bf64b…

MALICIOUS

PDF

79.4 KB Created: 2021-09-22 12:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 51f5d7ccf091eb4144d9dabe78a52c9d SHA-1: f44ec7dd3b0705db6ffd0ba8445bc7b1f4cd38b5 SHA-256: 7405742c8f5bf64b2705bb6ec46d0ab40f73244a1adf320991cc57b3a772e2f6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to potentially compromised CMS uploads or disposable hosting. The presence of a 'utm_term' parameter in one of the URLs suggests a phishing or SEO-based lure to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://pixomot.ru/uplcv?utm_term=how+to+remove+draw+pattern+to+unlock PDF link annotation
    • http://vatlieulamnha.com/media/ftp/file/rilokipometomo.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/fixirete.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/wezudedax.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/13073053139.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///rezezixuvilax.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/jakasojonolabog.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/60927541111.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/50910674672.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/99795321405.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/4707f97ccb0ed376230013d33a56cd1e/23101216060.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/masuxumoretisageviso.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/19003113397.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/28640294186.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613a407f9c57a---zugumenatakipemekuli.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/bulazovodatot.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210908_7B749EEDF28C7E18.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/gigot.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/dejeruradirixejupab.pdfIn PDF document text
    • http://quinta.cl/upload/files/gijijidoxezofas.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/jovos.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/95002788854.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7f138daf---98737962043.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/ziluvepirimozezemumekuwa.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/nevodareroxuxigexuve.pdfIn PDF document text
    • 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_off0000ce62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE62 18536 bytes
SHA-256: 621c085650bb36ecb24b86c8ca2c3fa44d7c780fe948a522e91d58e337c3ed90
font_01_sfnt_off0000fe81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11698 10752 bytes
SHA-256: b9fb224ae872dfd7a65548ae897a4d1cb743dbe43fd03e6e3bde5e67a73b322f