Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb748c7c2ce94730…

MALICIOUS

PDF

68.4 KB Created: 2021-06-22 20:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cb4140333bf2c66c7d8f52dbd37ebb8 SHA-1: 18226d51b504aa0950ffbdfefb7a544e7d71a081 SHA-256: bb748c7c2ce947300db6520e166204c9fff2a4b4479181e41ea5d223367d76b1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier as malicious and also detected by ClamAV. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting domains, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and a link farm indicates a likely spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://archism.ru/uplcv?utm_term=rune+factory+3+ds+rom
    • http://speaklifeiamgreatness.com/files/files/sapapa.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0159310160---xamibavonamo.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/8dcef746bfbad6e1401400276b3520e9/74404315377.pdf
    • http://iviltra.lt/images/files/devakuwegipomef.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/280b89a6b1d62128014e834002a52c1f/bakikutipaponukoto.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/1428895177.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/209e8f2014e6d5cd4c3cc8c16cc609c1/xefojajaxuwazar.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098baddf085e---81784906369.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/b6q1cibbb4muk1vbbo7u29ru0q/6763458868.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/4kferq9uo0jgpcm299fpnu7mn5/62958974045.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/1b7c4ee20727b2c390adfff3371b5d4b/tuvimoluxedemezavipo.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608768ef2d0cc---zuxivawomajonulalipaseb.pdf
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021060310231780554.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e081112e9---sowunutugerefajumosoxevu.pdf
    • http://phuquytravel.com/nguyenvanlinh/files/pinokaza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd22.bin
a01159222beddd2f44e5875804cbb9e6c7cb9308846e3170ee2a97be588fbaae
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD22 5408 bytes
font_01_sfnt_off0000cf7f.bin
a0fe2daada3f9176e98494b10909635b23cf183d11683fbcbfedfb157e9710fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7F 2904 bytes
font_02_sfnt_off0000db74.bin
4d11f45c8d100f51c62db400ac4371159f1c8e11956306e6489485e1faf5b3bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB74 12040 bytes