Malicious PDF — malware analysis report

Static analysis result for SHA-256 cddd9290e25fb8fd…

MALICIOUS

PDF

68.6 KB Created: 2021-10-01 09:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4c261187ac6a7e5c09f1207caf3707f6 SHA-1: 69d9c16decfa3a6c8dc6e10f5d7d6e48be85227e SHA-256: cddd9290e25fb8fdac68499e7a927222377d27097f1ffd4da24d8ef98df288de
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing or malware distribution. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to a malicious site via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://catamma.ru/uplcv?utm_term=queen+of+hearts+2019+movie+online+watch+free PDF link annotation
    • http://agppi99.pretty-match.com/upload/files/39217119541.pdfIn PDF document text
    • http://e5tbr2.alruaa.com/ckeditor-ckfinder-integration/uploads/files/fiwojirisitetunonof.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/ximofim.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/zubila.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426e802a642---31178143371.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/bupabezog.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/xenibevizafogusutukobef.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/wagemejudi.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/nigibofezi.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/zigutabujovop.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/kidorofujubalemitinopa.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/814900312.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/15645632217.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/xobezamamuxaradu.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/24226528357.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/62c4a0b20ce8a3a0016bdb7df4a13352/sobujujafudiwowi.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/lozegelimodo.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161507a04ba1b4---wajar.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/nujixo.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/xoweburusuwelurenugedez.pdfIn PDF document text
    • https://noventa.cz/media/files/file/kikaregigabixawumuwegi.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109171753515849.pdfIn PDF document text
    • http://exima.kr/userData/board/file/241168617.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_off0000ad9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD9B 11372 bytes
SHA-256: cce36fa6b2fb1e7143ed8a3150d6d50fb35c0c779be02471d8fb99d493159574
font_01_sfnt_off0000c87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87D 14484 bytes
SHA-256: 8193d534d8e2b8bb4545d38dfe67e764c93768348302f04d8adb4f3bcbe3085e
font_02_sfnt_off0000ec9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1