Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f9bd7ebbb07ff4…

MALICIOUS

PDF

89.7 KB Created: 2021-07-09 12:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1678766bc385c4050a1875f5c2866fa7 SHA-1: 45b1abd666fef791fb64a0ea82f76a58d0c69905 SHA-256: e0f9bd7ebbb07ff4937486153691a4c56a541856739b8021fc40394ccf4a2e26
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or to serve a secondary payload. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/3efa71bfa56cbe914e3bdc4c38e739e0/8045787503.pdf In PDF document text
    • http://adamslakeband.org/userfiles/file/nagim.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc039a3d48---nefuwalekedigulizijag.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69227681881.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/fetikemagidoxiz.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16093f34417232---sofofot.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/8ec3687ecf28e4d4b7db3f2853fc2a78/sewutelozevezejename.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021070413013260.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/e2o6uv6dbflhqab75r7qiu4550/majufivoro.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/ll9ug5lubbakv6p0vbdv2p5spo/botamipepowezaf.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///202178106404928.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/fajodubiwebovukefisixesaj.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/miwufedofexud.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/40647425222.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3695c07fc---92559114698.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/ruluropagala.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b79e782464---59418722476.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b1ab11cea---vifuxezuzegokosupifariwa.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16070effb40b3d---51530038170.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00dee83d4---wosopivalujajovixewuz.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/59d4d6ac7f20dc77e6f83c46a8e24ece/linefejidi.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c694b1048fb---depaxagejugexura.pdfIn PDF document text
    • http://dlzj.net/upload/files/2021053008331894199.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/28100826766.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/73142847491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+poorest+rich+man+novel+read+online+freePDF 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_off0000fadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADC 17256 bytes
SHA-256: af55aada2b0353bee734ebc79042aca084cf5b3dbaec5942a461d0c3302144bc
font_01_sfnt_off000127ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EA 10912 bytes
SHA-256: beaea18e0e45d6b3375041b88c311510a598d9d07f753984aef35e7761e13233
font_02_sfnt_off0001410c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1410C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1