Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b0ad1e0cde9ff0…

MALICIOUS

PDF

84.9 KB Created: 2021-06-26 14:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4af01e53e8a119ad4830ccdeba368532 SHA-1: be741ec88c82db3c6c23ec937b998c0803ca74ce SHA-256: 53b0ad1e0cde9ff05e498dc93c626e389262c28a9fe621295322be2b5422bdeb
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sciattella.net/images/file/43886873797.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/561ac195ec18f381747cee2d5fa0d9c5/komomukekewafifafifimo.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/melewofikubuzosuwenisad.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607db9d1e22b7---detidivizav.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160967b9c53a2b---kapesimiriki.pdf
    • https://gea99.com/ckfinder/userfiles/files/foxepuni.pdf
    • https://bnbcostaverde.it/userfiles/file/jerugozutivexuxofufex.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/80495d9a861d50db19dead021e9e1594/posezafemadipuxopulofazef.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-4-29/20210429065633936786.pdf
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/werow.pdf
    • http://turhantur.com/turhantur/files/gokijukomonijekakisuwuva.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e9aae304e---vifopevisuzuzaje.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34dfab33a5---30526448992.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c41fecdb6c6---najejolepewawogoxe.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d106b479b4---valufojigigisasajutu.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607f728f687b4---vajirizijed.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829413bc3f0---lupifonoginubexilebakujiz.pdf
    • http://koryosushi.com/uploads/files/suxerunopefuzejo.pdf
    • http://ducthoaudio.com/upload/files/17730155005.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32954b4b56---gefoxoxobijew.pdf
    • http://cobbpaynefamilyreunion.com/clients/862770/File/zananovazozemu.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/8af842bedcd898d457c6f60c087dde11/ripowetaxaruxibaponu.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/jexawaxozifefetotakodazaj.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/950e1c445ab5f750a7636dbc5d6d6f8f/ximudadizulewabodisemi.pdf
    • https://xosobacninh.vn/webroot/img/files/kirem.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=principle+of+superposition+of+waves+pdf
    • 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_off0000e5c3.bin
623851c25a1a17be6a07faa9d0b7b57d24a13a18f1a0326f237f4d7202e4f9c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C3 10864 bytes
font_01_sfnt_off0000ff0a.bin
20e173e87110b0fc9a20744b6eb7e111980c494570f6ce7c95da9a6bd48109c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0A 17772 bytes
font_02_sfnt_off00012dfb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFB 16792 bytes