Malicious PDF — malware analysis report

Static analysis result for SHA-256 479c77cfb788a1c4…

MALICIOUS

PDF

90.2 KB Created: 2021-08-07 17:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 66bdbd23e232ecd9a8ec0d13bda5a0e8 SHA-1: cc65d39a78cbed89cda6cb680e2709cf584aef2d SHA-256: 479c77cfb788a1c40c829f9b9cb1687b063ae64ce3fd7aacebfbc03af841a7e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress upload directories or disposable hosting. The embedded URLs suggest an attempt to redirect users to external, untrusted sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://uralinteh.com/uploads/files/44862118648.pdf In PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29ee29d504---57954116550.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/sefasesovaniponafovu.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8008371463---sezibepik.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106091546.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/vifafuwidupated.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/39300759442.pdfIn PDF document text
    • http://geose.ru/userfiles/file/15046132766.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/34901081993.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/malokigowefenek.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/14622754991.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aedd68004---48272925657.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608872155720a---10178500768.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/nokuxukeguzufepu.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd28b7dca8---digowisusovoj.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/594e9b2465eace1e5caefd241c1261ed/nidunegaf.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/dobonu.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/60509536884.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/14745965972.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/42013517598.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/taxuwud.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/retarilikomi.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/pojiburisuladanuposiwogef.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/5769062752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+do+lactic+acid+fermentation+and+alcoholic+fermentation+differPDF 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_off0000fda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA4 16988 bytes
SHA-256: ecc1caeec9abdea14586f96f9486ffe9bbe1d97dadf8b8614dc0641c3b794f25
font_01_sfnt_off000129dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DD 10648 bytes
SHA-256: 1abe46ee4fb14178bfb76816cc2c8cf745441a72bc1ffa5bc95df3e936c8a2e1
font_02_sfnt_off000141fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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