Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc97aaec492320a…

MALICIOUS

PDF

75.4 KB Created: 2021-08-03 18:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 10bbfe17297f9279f271b41eddeb5a08 SHA-1: a48d4d8de334b2d7ec02301aa169833110b9ddfa SHA-256: ecc97aaec492320a6b202456e625209e84e613396e70d31d2520b1d7e37ad360
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33c8edd87d---motedopepanu.pdf In PDF document text
    • https://lapiadinafelice.it/file/60346131735.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/b5gd9p06gou7tjt5clsudmadbm/mikaverib.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/jubul.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210730184526.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16072dd4c082e9---91119943699.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/gomawewojakazuvumukumax.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/zegotelanose.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160815ee862484---83642460968.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/87113252357.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/wavuko.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/juliwot.pdfIn PDF document text
    • http://vo23.ru/upload/file/wumufogajifa.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094ed0f45cd6---xibolevesi.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/d21bef625e2fbdba84423d6c4e40d322/fazugixiga.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089707067876---regemoxujajoxule.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744bdead88e---bilejusonivasoxexowuw.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/tetafeviwidetev.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/86387982071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=logic+and+computer+design+fundamentals+3rd+edition+solutions+pdfPDF 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_off0000c1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AE 11192 bytes
SHA-256: 3d62551ed061979bda16692c7fff946323aea46f7683be8ec0f0858371d61647
font_01_sfnt_off0000dbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAF 16652 bytes
SHA-256: 48d6f9d01b7655e6e50593b7a9d769817d9641ef2ea454def068f8cd621935fc
font_02_sfnt_off00010788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10788 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1