Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9ac3588c6ec9a5…

MALICIOUS

PDF

71.6 KB Created: 2021-10-05 07:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00ac9ec51a7fbbc8400da5dad51c5b86 SHA-1: 32885fe16f89cb701b1fdda7f8993e2f246adcb8 SHA-256: ca9ac3588c6ec9a52be0687be9820672906b535ea52d966257ca0c2c2739c763
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to domains identified as compromised or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161384f51c1d15---rifuginaziv.pdf In PDF document text
    • https://hoalavender.net/upload/files/maliwefubogifi.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/zotov.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/75564677112.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/57744270799.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/subabawaxufef.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/97273845424.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/69283987582.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/pikawejizezufigimes.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/fezipetifokifezekig.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/af70afbca39119b46957d0c958efa8e5/87504096557.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/8086884876.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/zaropegeba.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/57721781551.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/29e48c546f3616c8785160998d75f73d/68592335189.pdfIn PDF document text
    • http://acelybio.com/upload/files/xikebefapojalifemavivose.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/zutem.pdfIn PDF document text
    • https://emenu.hu/editor_up/32316756184.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/12792330979.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/54402815634.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/83553322777.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/76114903450.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/67007196676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=best+free+pdf+converter+for+windows+8PDF 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_off0000b819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB819 10816 bytes
SHA-256: 712458226dae5d17f1e0e81ae76aeee907c8bbf5a8027c581fa67c51be9231c0
font_01_sfnt_off0000d141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD141 15600 bytes
SHA-256: f8c18ab06e2dc49440e351d2d20fe95a22f74f32cd8c3607d26573a9ad5e4800
font_02_sfnt_off0000f918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF918 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1