Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b74c726aaf3014b…

MALICIOUS

PDF

70.2 KB Created: 2021-09-19 23:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0dd19661afb9856760ef207fac004ecc SHA-1: 69f6e56b0278bdf76eaa02d7325e94036c127ac4 SHA-256: 5b74c726aaf3014b4815faa53f22c5cb2f7ea7e3e7f76618f6d94a4c98fcb357
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised or disposable hosting. This indicates the file is likely part of a phishing or spam campaign designed to redirect users to malicious sites. The embedded JavaScript may be used to further obfuscate the malicious intent or facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=memoirs+of+woman+of+pleasure+pdf PDF link annotation
    • http://hwangtosidae.com/userData/ebizro_board/file/26559941284.pdfIn PDF document text
    • https://kulittelor.com/contents/files/62462240276.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/rijakotodu.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141f3094a9c2---dubumu.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/98035157054.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/murezevuluvovosofi.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/kafekeravofopom.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/vukinidobo.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139c98e38d99---41604228009.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c5433c900---desugokuduguvazofegafuwex.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/41006498501.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210906041621.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/713129ed53d9abfd662f83ec08908d6f/37964108772.pdfIn PDF document text
    • http://rapet.hu/files/ridasolofif.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/lakawavodonowor.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/xutaxoremudewebo.pdfIn PDF document text
    • https://phunhai.net/upload/files/80645673852.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/82f0dddc0a834aae35e51b579dfe0c18/tutopuzirebarunudupos.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/34494027739.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/ganeguweperusiz.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_off0000b130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB130 10740 bytes
SHA-256: d7c8c30af97958f4040774dc519ed8c5e34fea5bcf0019f89cf51bc51741bac9
font_01_sfnt_off0000c9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E1 16376 bytes
SHA-256: 2bd0f63fccc906dc979876f555c094c6331208ac21f396b0eb3159664733e36d
font_02_sfnt_off0000f379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF379 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1