Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f687f6d2f6c15e…

MALICIOUS

PDF

81.3 KB Created: 2021-10-09 04:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 768ea29e4d32d0a44fade7b4c5077b17 SHA-1: aa804a1415e5bc529911156897445d6420433946 SHA-256: 85f687f6d2f6c15eeada9ad3782b37dca1e3527fb91b5407eeab652d6d57490c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to distribute malicious content or lead to phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://drafthe.ru/uplcv?utm_term=night+clubs+in+new+cairo PDF link annotation
    • http://heryeryesil.com/resimlerfiles/44086583353.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/14235334707.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1632897799/file/gotif.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/fikola.pdfIn PDF document text
    • https://suksesunited.com/contents/files/likagisipujinebetujezituw.pdfIn PDF document text
    • http://xhslsh.gdx.cn/ckfinder/userfiles/files/xadedavewavoxotuj.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/84233973181.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/h11krvc7jjk5isff18ntvq0721/nesiduvupekaropopomiz.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/fobolubofanememalisuziki.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/17047101237.pdfIn PDF document text
    • http://tion.hu/upload/file/96373712029.pdfIn PDF document text
    • http://synphabase.ch/upload/file/31864542239.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/mulawubam.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba3da3034f---bexepupabuwakixas.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/58512366908.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/32986475143.pdfIn PDF document text
    • http://nairmobilya.com/userfiles/file/43780579818.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/72932230418.pdfIn PDF document text
    • http://sergeybazarov.ru/file/vufunifakegat.pdfIn PDF document text
    • http://ssp.by/var/upload/58738766073.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/12922559681.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/d2afc9a5b7336dee55a4ffdd4db31441/69196719764.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/81750310097.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/75241702977.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_off0000d93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 10812 bytes
SHA-256: 97e4098bb5ed5bfa3404cab8ebf93a6aca9ca77c54006000225cf2530c8a0671
font_02_sfnt_off00010a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4D 17432 bytes
SHA-256: 8aba125f1a42881824f8486bcfc97373cc1ee909bfb96a7f217ab23b9c40804d