Malicious PDF — malware analysis report

Static analysis result for SHA-256 842629deefc31465…

MALICIOUS

PDF

84.0 KB Created: 2021-09-12 19:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a256e5f4f10f3ca39a4fe77d88edf258 SHA-1: 0944680a92353f2b8b90ffc5bf9a6c1424dc8a9f SHA-256: 842629deefc314654ce634fd788f609224cb0b5b35600823dfa8bde2bbe5ba04
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to various compromised upload storage locations, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the 'link farm' heuristic suggest a potential for JavaScript execution or exploitation to facilitate downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://d2dgroup.net/upload/files/felaxunixelamudufa.pdf In PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/3c3fe41d6770aa01a5259f253d1fcdda/9709670747.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/bofujug.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613266a6d39c0---jamorulifilitavobi.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bec2d7553b---61486552390.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/sazifibexajopasixis.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/65369912134.pdfIn PDF document text
    • http://panova-art.com/files/file/4627657901.pdfIn PDF document text
    • http://bwc.lt/i/66918189986.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/13202137992.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/1973504439.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/ferewinamarepiwaz.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/19930193994.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16137bd9a4cfe7---57757594256.pdfIn PDF document text
    • https://digireg.se/upload/batasuduxefazetumanoki.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314af98d79e---venifolufaxak.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/mevipevemotepol.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/58387347312.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/40286219213.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/nemuzutisezolejewavovanu.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/65484950940.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/ramozenebal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=download+windows+10+pro+iso+file+64+bit+activated+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_off0000e071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE071 11324 bytes
SHA-256: c33393c2cd97a817a5ab97fc23c7ddb0adc58387362bdec604feacef1dfc16a8
font_01_sfnt_off0000fb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11331 18380 bytes
SHA-256: d6357b91ffe490015cadbe93af01205c0a9a41c199553d8d3e6bf808d009f525