Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4260fec7aee87ef…

MALICIOUS

PDF

78.1 KB Created: 2021-08-24 03:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2f5acc3153b4ef35a501b0121e50298 SHA-1: 1b921f90e400439c9ff2dd5255c8f32c1a4c4508 SHA-256: c4260fec7aee87ef04e844e1e1ae0c15a11f23cbfa88286945dcb879c4771427
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple distinct hosts and UTM parameters suggests a link farm designed to obscure the ultimate destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6426

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://wastran.ru/uplcv?utm_term=good+resume+picture
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/7dd4063767db0da4c593d616acae2c7d/jadiruxewiwuz.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/98qfk0oks5c063ictgvgql2ror/gukiwix.pdf
    • http://sjar-tech.com/uploadfile/file///2021053023424813.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/fmc85s7nerk6ao759rc7uerop1/74921200612.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6baf7a713f---mofaruj.pdf
    • http://bukharaatlanta.com/sites/default/files/file/mibivexeruzogosekazisili.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/c32180e631f46c6ee5b7cbf3300bf263/21428871005.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/0ff02fee00bee222e2761a411081f57f/sidowifakiximekowin.pdf
    • http://webinside.pl/userfiles/file/dokaziv.pdf
    • https://client-sms.com/ckfinder/userfiles/files/61257528470.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878c9b83602---bipotoxonapavulubepup.pdf
    • http://capitolmetrophysicaltherapy.com/files/files/64220719087.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/b55b6b2b69c431aa16429833d68b63d1/faletag.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/e01f1998451e1159b9c81961e4bcf7bf/23217548785.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160f5f8a1426d9---nadalitakulamijufune.pdf
    • https://alakharia.com/public_html/userfiles/file/62771318014.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/e599467efbd3467cb3744bcd3bcc1bd3/wukej.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4c69648dc92205399ec80677cd9a9db/dakikolonukewatakaned.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/16911425335.pdf
    • https://fidelishospice.com/ckfinder/userfiles/files/55189504280.pdf
    • http://morpheus-architects.com/file_media/file_image/file/52437627313.pdf
    • https://fullmagicweekend.com/ckfinder/userfiles/files/kivefegonevajurebuzabog.pdf
    • http://mesahighclassof63.com/clients/79820/File/89714118156.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f29a.bin
23e80eccd788939e1fd72b42320b358625a4bce10bf0932c972f9cc25849cd8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF29A 10504 bytes
font_01_sfnt_off00010a89.bin
a82c56aa5ab6f6cf113b1c5d37f887db6073a1d483edb1c2d72d947202104c6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A89 16972 bytes