Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83b465d58157ada…

MALICIOUS

PDF

83.7 KB Created: 2021-09-16 15:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5f84933d958c7152cd18cc6ff5ec43a7 SHA-1: 284bd329332d65b6a6159ca0fe653d0cc95381c4 SHA-256: a83b465d58157ada1726c4522db14c2310a92e87eb018d6499ade32f3d9c69d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. No scripts were extracted, but the extensive use of external URLs suggests a primary function of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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
  • 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 https://coretry.ru/uplcv?utm_term=how+to+make+your+camera+clear+on+android PDF link annotation
    • https://eric-parnes.com/ckfinder/userfiles/files/pawiwan.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/vusuregudagaxeradil.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/17125696834.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/17433644989.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/61699529813.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/04j3rplsm7ja354pc5ta2dn17j/medejifupela.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/b20dcb0b4eae1e6ed3db432489217fa9/wavofupimono.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/91491922882.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/lemonadivifubirurodenezol.pdfIn PDF document text
    • https://webaprint.be/img/file/rubomuvoniker.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/83251471694.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/44072681852.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/83910466638.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/63158313748.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/oeth22q2010645m0i301og0dug/wipepupefitadoropokix.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/fetepujinalivusovisulado.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/soboresapodaxipufa.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/4p22u21mson0a3piulm1jibltj/woxazi.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/38663133796.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/28414423564.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/37356102393.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/32132545097.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_off0000de6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6F 19148 bytes
SHA-256: d99e9dc6a4f1f8cae517faaeeb7e95056202973b2b3b32eef952c9446628dd70
font_01_sfnt_off00011004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11004 10748 bytes
SHA-256: feec06be7eb36d32e4e44436b2cf8547ef124c26ef5c25f9640a703e3d19e1b1
font_02_sfnt_off000128b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1