Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7cf5d6c26b67f0…

MALICIOUS

PDF

88.8 KB Created: 2021-09-01 12:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8e3f9bab28ffd2c561f59c319e5acf7 SHA-1: fd02b480c4e503b04e0239c7ca089c71777b5346 SHA-256: ad7cf5d6c26b67f041183db42c490685c16aee5532195368d743ac28f2e43d29
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous embedded URLs pointing to compromised or disposable domains. These links are likely intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://lnimeina.it/userfiles/files/78037615409.pdf In PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084364f208c8---xigusefugenimiwup.pdfIn PDF document text
    • http://nstyapi.com/resimler/files/mumirunaxomogulizadibub.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609918eab23a2---21865480072.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/xorugapotuxomosafujoz.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/74153301179.pdfIn PDF document text
    • http://119pump.net/d/files/14622847662.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/96241463278.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc483b1882---34895263364.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e431f3bbf---47755518188.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/lawunoramomima.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/roxata.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/76224962429.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/xiroxoninewen.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f65552e6d09---11676378315.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160f2a9ab288a9---58358661008.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c3ddf0d0f---44259913377.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/515514881d9676ae98e0f5b4d967cede/poveparesus.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/vavegegusosuvugakulipivi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f62fbdf04.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/51985309748.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075e8ccc639f---28749848636.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/vakexivoros.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=prominent+constellation+in+summerPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/31099113171.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_off0000f651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF651 18200 bytes
SHA-256: b7961dfb3415cd745838441912028bb9d4a3ca9eeada4764be98bbfc212725a7
font_01_sfnt_off00012585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12585 10492 bytes
SHA-256: a5098866ef35c5cf0347bcb38e55a4e6ad43ae03e41d45c8dd955444199aa59a
font_02_sfnt_off00013d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1