Malicious PDF — malware analysis report

Static analysis result for SHA-256 63893f1d3f41705a…

MALICIOUS

PDF

109.0 KB Created: 2021-08-07 01:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c5ac192e223b8bc3a992a64a9b1ee608 SHA-1: 0b48598b1414bc19fdd7074fc06327fb7cdd4721 SHA-256: 63893f1d3f41705aefe82048141311908309d18108e8387f50cd2c373809dc16
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs hosted on compromised CMS uploads and disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089daa1e1d4d---vejilusivupew.pdf In PDF document text
    • http://nct-vn.com/userfiles/file/tedarenegasudekog.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/fb1eb998b93c5758a0ef0e9fa50e9083/32506658364.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/7358338042.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/47647586771.pdfIn PDF document text
    • http://sns.hu/_user/file/4109531194.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/pofegoxexunamekuj.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/93963225805.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/o4eo0dmutnmrsk8eev9neus9i3/pibizenazopeputo.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/2f14dcb39a96ee49a8fed55dc9bb01e4/47465448121.pdfIn PDF document text
    • http://haai.org/upload/file/28985984857.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9976d78f57---kubixoduwaxizikifeliter.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/63210386850.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/4190330860.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/meritedagezapiruzosi.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73a16e605f---53069050581.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/puxuwelizibafuvafusufo.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/823bd4bee45fad2c10e656d368347e8a/nomefakupomorumos.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/0f70dd22777ec9830f662e3a1dea5a05/salozorid.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/70845933809.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/wosisojaxekonux.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/36412029698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=los+mejores+juegos+para+emulador+ppsspp+androidPDF link annotation
    • 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_off000144a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A1 10824 bytes
SHA-256: 8410bdd77c57fe203ebde7e3df8056feac5ae400b1f4119e9632f7154df61f75
font_01_sfnt_off00015d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17551 18456 bytes
SHA-256: 7da8b1e475e9d6f55ec16d9786261c9e775390bd3e259f7854aa44dc785a6e73