Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb60d6a636079573…

MALICIOUS

PDF

77.6 KB Created: 2021-08-27 23:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1f2fbb3399fd499659fd71348dfbc91 SHA-1: 6a7a9100bd2701b59c44f7b5e77a482b79eb2097 SHA-256: eb60d6a63607957350fc28a129df8e8406c96050e2e975bc25e1e14001d38a3e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing a second-stage payload via the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • 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://catamma.ru/uplcv?utm_term=foreign+body+giant+cell+granuloma PDF link annotation
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/520ad7ad9ba64975def87e4655740f9a/kixenotele.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/bozowinasuwox.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a75994c2b5a---rirarozisosomilori.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d4645340---66189750156.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098401376270---bakuvigatev.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a433cf5bd78fd7481a6abe21e9752eeb/katuxejasibikasobepokenix.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/785625579.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/botixuxobatatufod.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607784c5f010d---danepowupofijatibapefa.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rusugunapisibexenedumosiz.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/233d1980979934ab3f3fb3776d8f6e3a/vugobemoxinujabutirerag.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/61146507f047c.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/lonobutomoximetomifukabir.pdfIn PDF document text
    • http://pk.mo/userfiles/file/78001231512.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/16525383806.pdfIn PDF document text
    • http://yejida.com/userfiles/file/97793374077.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/78403653161.pdfIn PDF document text
    • http://kotolantopeni.cz/file/18958923417.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608325252f695---90260891344.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/5604526417.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/2f5447f6331db2f3d78096c44faeb266/wifovetatogibidazes.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/087f2e03fd06f9787b7b3afa6752153d/35198672350.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/renenokux.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_off0000c889.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC889 16792 bytes
font_01_sfnt_off0000e0a0.bin
f1941dd4112b4fd0633b11be99db2765bcef1670158e9c13f8d350c8db9924cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A0 10876 bytes
font_02_sfnt_off0000f986.bin
f7e87ab7c50366d3fcf3c4c063be9e68d03b9f5860c75dc1dbff94bca3aa209b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF986 17752 bytes