Malicious PDF — malware analysis report

Static analysis result for SHA-256 672ed4550b81025b…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 01:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f829cb3b90cd75220440d43c67ba1aca SHA-1: f2092a0e441c08dd793f975cf644b4b0ff25bc40 SHA-256: 672ed4550b81025bd086cd6aecee827090dafe66469e4d92c92b0b5f2e43d568
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160875ef03fd87---musopovolaz.pdf In PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7ec3b3714cbc78598288fc20866713d1/63356459217.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/90631496072.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/jomipuvuziwikikebiboje.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/59459510701.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/67211680612.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7045b665df---vozixid.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/nifewapebenaxolisiwivavur.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/nivotuluxum.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/sobapopepukivole.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/69726756235.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/9556729116.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/pumive.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/4b96455b69117493d7b5c56ac7998207/32001267531.pdfIn PDF document text
    • http://budka39.ru/files/96429535633.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/sorasasim.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/dodobimumezagabafudeturo.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093a405b32b1---gomukewezikika.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/jabuxegilekigenuma.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/26560805802.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/9d546ceb414ad7c083579723ab577a51/bawexiwodikosubivoju.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/22641634157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=harry+potter+map+pdfPDF 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_off0000d7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D3 10352 bytes
SHA-256: 9a71266dc6647779d81c7956013bd75aadf9b6fd0b301bc30a8124fa5da31b57
font_01_sfnt_off0000ef35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF35 18088 bytes
SHA-256: c5381b869a29f7a87cc7ba2a9e34841f808c5eed10c8de061f3a425a91e5da4f
font_02_sfnt_off00011dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1