Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22637288edbf443…

MALICIOUS

PDF

86.5 KB Created: 2021-07-10 11:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c94ff0d64daef4ee677c9bc41eef0f4 SHA-1: 9315ca144aef6823dca78b1d99f1e9ec43a78823 SHA-256: f22637288edbf443750be4f6688be1e654ab3814fd890e9ae7cf7b1ff22491d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/u5jl89d45gl3bjm9lpjnj9ohkn/loruxezexabojawopamagus.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/f683a4a00ae1f1c2b982b31f2e94a74d/88891602686.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/a1da1d5e6f2769d6c8fb75152d850bf9/biwizo.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098fc8b1019d---44334420785.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096452b23e7b---29996288025.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a07365e2b---zibezuxolalomobafuramof.pdf
    • http://geo-equipe.it/userfiles/files/47062671281.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3226059007---18346317176.pdf
    • https://rimsball.com/ckfinder/userfiles/files/pizigawigomakatixutipinu.pdf
    • http://gd-weimi.com/upfolder/e/files/20210531164242.pdf
    • https://equator-maritime.com/userfiles/file/jutogemiz.pdf
    • https://heatingboiler.ca/fck_upload/file/78305471722.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d030d8141---bizisuforudirepatuwabine.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/nrlhfbi7u4pak57arkhopic8n5/98870192755.pdf
    • https://mvservice.it/file/31080789714.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff8ae7dc48---sapibetavopuwujatadiwati.pdf
    • http://crmrealty360degree.in/userfiles/file/jugazawogimunuwominuv.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/e6bae46f7eb6a8de9f2a33a76054e6ff/20953382992.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e8711565c---vikewagesonisejeziba.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aaae0231fe3---sivisuxozamasus.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=dormered+cape+house
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ae.bin
2f83ef279e2188879500e969ce2ee4d3a5df4f67347f4c5baef74032ee84ce47
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AE 10540 bytes
font_01_sfnt_off000108a3.bin
51b882cd2770947e2bde950ac170cbb9310307e9feab11cfca4deb833fa44c51
pdf-font-stream PDF embedded font (sfnt) at offset 0x108A3 17092 bytes
font_02_sfnt_off00013557.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13557 16792 bytes