Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e7a274ec44140d…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 00:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 32d013f3f422014f3aa3054141e28db6 SHA-1: 353983a064604787251bc78bd7175d79b07ca415 SHA-256: 66e7a274ec44140d59ad7d3c26b755fb7744c9f3eaff7f73ecf1d9ad54a1c447
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains or point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://ketchas.ru/uplcv?utm_term=mahouka+koukou+no+rettousei+episode+1+english+dubbed PDF link annotation
    • https://simorgh.it/uploads/file/satabes.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/38274907458.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/junag.pdfIn PDF document text
    • https://m-audio.vn/img-m-audio/files/fifapejij.pdfIn PDF document text
    • http://esen.life/userfiles/file/48998454933.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/86083765793.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/naperetowir.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/c552661fbeb5adfd568f76aa54ca6b7f/xukotipobozuxik.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/fawavizimoludexabatatabo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9bf84d655---53186531115.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/jijamufelutogeto.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/dupefozaneluzaxodo.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/vorujadanek.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161401e844932b---fomajidarimuposo.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/vuritunenasezejixiv.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/20417913.pdfIn PDF document text
    • http://epicridesnepal.com/files/24971729787.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161401ad541585---kenuz.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/mewijaruse.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/99468204204.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/15368841406.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/93842809828.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/lijesejurukizozew.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/32207473591.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_off0000c872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC872 21848 bytes
SHA-256: 6f0d5b945c7d98a6aa6b5030793fa2d150744fdd451e89079a0406f275ab28ae
font_01_sfnt_off000100ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BA 11048 bytes
SHA-256: 92c248cb47d03b56b1436c20b42b9a5ca2b3950c65353bb0cb6b064b5f37b879
font_02_sfnt_off000119fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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