Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cff912565f84c1f…

MALICIOUS

PDF

85.8 KB Created: 2021-09-14 11:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d73f6e98c605ba24757a82f8fad0a057 SHA-1: 61c064837eb9d2d7ec04762dacdb2f158dd50a08 SHA-256: 9cff912565f84c1fe231abc188e31d30d28c7243536f78b6f5a1c1f364df85d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://crewmak.ru/uplcv?utm_term=best+graphics+open+world+games+for+android PDF link annotation
    • https://venefoil.com/ckfinder/userfiles/files/77331568681.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/94893621585.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/15188843122.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16131215781957---rorejalixotamifoxotiru.pdfIn PDF document text
    • https://tivicom.vn/upload/files/mifudasik.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090416100752.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/18709321765.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/69103676700.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/moxuwiselipigu.pdfIn PDF document text
    • https://sanagustin.cl/files/ponepelujewebokusexarivun.pdfIn PDF document text
    • https://777mto.info/contents/files/vopizaraxiwivogule.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/gupibimenibewopabesu.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210912031752.pdfIn PDF document text
    • http://119pump.net/d/files/dazalunisasakilebatem.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/vrvh44plj3j3qmcpmabim7v87g/87448532629.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/20d1d3d686ebd8d4e8d1b3974ef0c8b8/wajitevilekog.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210910171156.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/nidodazibipadulutatane.pdfIn PDF document text
    • http://lovesenergy.nl/file/88879262768.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16139ca7288e45---fusolubedixoxep.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/fawanixukomemami.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/getuwa.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_off0000eaf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF1 17188 bytes
SHA-256: 9690a7c594323e98ac89b40cd0ef17aa9b73cabdc9d2e04386cd3c7574b3da8e
font_01_sfnt_off0001173f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173F 11208 bytes
SHA-256: 336e31bf3ca3a0d9b19fbfb02aa40c8e49236869de7286466d7bd4ac825fa914
font_02_sfnt_off0001312d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1