Malicious PDF — malware analysis report

Static analysis result for SHA-256 9806aaf3d5376437…

MALICIOUS

PDF

91.1 KB Created: 2021-09-01 02:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 177927c637af0a41606bd000252a14c0 SHA-1: 2bee159febfadcc746cf480d3422a13b529619c3 SHA-256: 9806aaf3d53764374db2b9cf76dbc5d1ab16aaf419460fdc1ffa504f180de0f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and numerous external links are characteristic of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://lukasikgroup.pl/Image/files/lirafepawojafu.pdf In PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/1d509c27384fb9a64d326eacccc90bda/zafupisafilinato.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870453335f9---57023217320.pdfIn PDF document text
    • https://tipresentoio.it/images/file/19159920788.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/pafonekilesozu.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/ph4oegdi4aqe3d3qs7j24hsa36/kilubavomimawaduma.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/b0918ee405adac3293c1f762d2a84ea7/32195520206.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/62810121891.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/xekokojegiminofuro.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/zitokanosovu.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/tosab.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/pijaga.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/genegajirotodemug.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///46220416172.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6fa1213d1---jidoxexipe.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/sikawata.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ern163mvurcknpk71qn5que8a1/45598554025.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/zanik.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/cc50d5307759fd54819db3313fc50b93/xumijofuriwisejogoliwup.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/kaxomegiledelizidusuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=1+and+a+half+pounds+in+kgPDF 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_off00010574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10574 10596 bytes
SHA-256: 33d697e4d18fd9d304137cd9dbdb71576a94b7391fdd6eaa8cc4be7b729230b1
font_01_sfnt_off00011d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D44 16288 bytes
SHA-256: 69af159a4a85159d8e9f2b66003be1941b2b5aa9299ca8dcdf255fbf38d03d09
font_02_sfnt_off0001471c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1471C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1