Malicious PDF — malware analysis report

Static analysis result for SHA-256 5164647a268f9733…

MALICIOUS

PDF

73.1 KB Created: 2021-09-15 19:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 40034f795e8c56498d2d0123f9261f0c SHA-1: 8b7f36dd253b7508cd4c81e36390e70c9d451618 SHA-256: 5164647a268f9733ca90b3ab7e23efdf4a06e9478074d256bc462cdde2d0d363
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate a link farm designed to redirect users, with one URL specifically mentioning 'fortnite android skin galaxy' as a lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://allytemp.ru/uplcv?utm_term=fortnite+android+skin+galaxy PDF link annotation
    • http://weiken-rc.com/upload/files/89529340050.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/voxidokiripiz.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/zawitesusepopuzonovujiz.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/80648996808.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/69243478310.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/gitumokekonumuma.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/13394571083.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210906185542.pdfIn PDF document text
    • http://linker-apps.com/files/87745665016.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9fb3d591c---34830428976.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613caddf38d88---dukebedelowez.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/bojomudipefivefadum.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9fed7afd3---11298240046.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109080132153675.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/844e67f7beef065db3bb5cd52eaf93b0/kobegineruvalobujik.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408da7355de---nanuzifunezizenakejezu.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/kawoloziwozox.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/xemekoxekitinajobivemij.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/74984706cf25bd84569aad9b197bd07a/1207517367.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/jasomev.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/76796843786.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_off0000ba0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0E 17188 bytes
SHA-256: 07c50ca5ff7217d892cb327f6e1a2514263de2ddd92bcd67c311d79054df1fc5
font_01_sfnt_off0000e67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE92 10708 bytes
SHA-256: 17208f08b51614ba77981995a731014ca9048ea97c79f42a7a88b1ecf387ba5d