Malicious PDF — malware analysis report

Static analysis result for SHA-256 da04d88e77a855a1…

MALICIOUS

PDF

71.9 KB Created: 2021-09-17 15:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3116a8cbd55f78b814c80e0951387ffd SHA-1: 146d5d37aa988b6f92f2d2601980199fd728b2c6 SHA-256: da04d88e77a855a1276fc94871303bc346ab2837f73af0dd370e84ac51e853e0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links. Several heuristics indicate that these links point to compromised CMS uploads or disposable hosting, suggesting a link farm designed for phishing or malicious redirection. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=cricinstant+app+download+for+android PDF link annotation
    • http://vers-ma.de/userfiles/file/67121254580.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/59176354386.pdfIn PDF document text
    • https://777mto.org/contents/files/bewifa.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/vasixeletadex.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/3337711076.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1514c341b---81419635550.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/59903912892.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/tilededikalap.pdfIn PDF document text
    • http://tdbm.vn/upload/files/surefefuk.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/85724328189.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/natonenereguwepidegopu.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614247784099a---posenuvapoze.pdfIn PDF document text
    • http://xprchemical.com/upload/files/bazeladenupobam.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/19748402086.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/gulokonisu.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/dumewifemugukig.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/mojunesivutus.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/58003910947.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f6f897800---86962730578.pdfIn PDF document text
    • https://subded.org/userfiles/file/sofefawidofadijavatut.pdfIn PDF document text
    • http://letdentalab.com/img/files/zijaderiwutix.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/nojafopobupuravapalegaru.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/jarokejiveredunikir.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/25766142539.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_off0000b6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CE 10600 bytes
SHA-256: af77b54c22721dfa1917c5838448c16f6b36a5894949029cdeb8e1424619f229
font_01_sfnt_off0000cf33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF33 16792 bytes
SHA-256: 5bf5073dca1c3cd5d85b70a3810a26992d771fe8724e1c7facfa2ca03a5a6333
font_02_sfnt_off0000fa1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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