Malicious PDF — malware analysis report

Static analysis result for SHA-256 d115f447fde13b3a…

MALICIOUS

PDF

96.8 KB Created: 2021-07-30 05:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 843fad5a24c3567e4ff0a00e6896cf4b SHA-1: 95fedce924a65e2f750049af8ee433d46ea6b591 SHA-256: d115f447fde13b3ad3ef65032bebaadf48aac3d98befb0ee57a4adea55ecf242
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://spitalmoldovanoua.ro/ckfinder/userfiles/files/44189785124.pdf In PDF document text
    • http://ampletrekking.com/userfiles/file/wirinij.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/88960710681.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/varozitususaxar.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/ribemojob.pdfIn PDF document text
    • https://sambelteri.com/contents//files/37201370541.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/40547385429.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160813b1986a09---60889068814.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/30045394429.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/55686705524.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b621e8abbb1---79192387975.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/56197159264.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608d89650e0a2---gasusulujuwokode.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0463140b1a---kotubirifi.pdfIn PDF document text
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/genunutege.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/fozefajajixekevexipebis.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/sujokefababafutigajip.pdfIn PDF document text
    • http://starlightskiothon.ca/clients/4/44/44db284a3a4a6a3f34f8f2fa71918f98/File/buvitixepekis.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99b9f0f15---65939199388.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607437c485f61---39990254521.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/2368442363.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/48034808550.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/gulug.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608cecdea4e6b---4415680028.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083ec0563f06---fokidebeduwiditevunojuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=las+venas+abiertas+de+america+latina+resumen+capitulo+3PDF 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_off0001145a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145A 17792 bytes
SHA-256: e66f6137e156e8bd738e91c1821bf4aa2dc01ff298c311b306330eb357a38c29
font_01_sfnt_off000141af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141AF 11112 bytes
SHA-256: 0b6d835f4bafd10694e0bc1e213d499c07d1c4ebadf1617486430a8e2eb1bd0e
font_02_sfnt_off00015b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1