Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7934d78ea04783…

MALICIOUS

PDF

114.6 KB Created: 2021-06-13 09:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 584a9e33d3431b8a4af3f0dd3eb6feaf SHA-1: 27bad93841f11a6b40cc09b227e4fef679dd8325 SHA-256: eb7934d78ea04783dba3759648afbf5ff055dde8586605b85452a7668cbee461
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://oniceh.ru/uplcv?utm_term=roman+name+of+aphrodite PDF link annotation
    • http://zabradli-znerezu.cz/userfiles/file/wupigojepi.pdfIn PDF document text
    • http://dhf-china.com/d/files/wegad.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/2736f909dd383eacfdeb9cd337d1d8da/xufedijejajupigibojosuv.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/f73ak91t9n317mkqrr6m83fnis/laxotuvotoreromuw.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/7eeb3cceef91189065798d1af0d0cc26/95291007396.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d432ee9af5---digenekanekex.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/m78bk507tp8qaljinosas9njm5/25566264119.pdfIn PDF document text
    • http://446888.top/userfiles/file/mukogogaxatiguf.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca9dfb6adb---tugesowutapetidez.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0604/dbfd55edf3a34c7c29bec7dd22ecd89c.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/teletavo.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084b7e6e2cd1---bubafoperolusulunedobe.pdfIn PDF document text
    • http://capital96.com/userfiles/file/20753881247.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/zajirolexusigazibakenesuv.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092d6c9cbd03---17945523320.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0b4bd1f72---mamibedagazukufila.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13542 6416 bytes
SHA-256: 528d1e79c27aec131c2cbf846536b85f4c117e3725d0fa982f5a85159cdab222
font_01_sfnt_off00014514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14514 5076 bytes
SHA-256: c821aeb8d9defd9b9e14ef38be6e4d06d274d133e3d70380de929becf70bb31e
font_02_sfnt_off0001562b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1562B 10108 bytes
SHA-256: 87fa451d971e6bb465c0d7885b5ef89e97fbce2852750205531e1f682c7a4378
font_03_sfnt_off000176d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176D5 11572 bytes
SHA-256: e23526c127bf538b16f0951149d0c3ff7765d115f3793fc159be964b5f75a257
font_04_sfnt_off00019da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DA9 16256 bytes
SHA-256: 8cc6bcc2cf3defe0a88aedbd81e1c3d6ddceaf294630c8a268e5b6d92b2eedfb
font_05_sfnt_off0001b306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B306 1736 bytes
SHA-256: 0d9b6ab0354368cdfa5a4e52e4dfb250ede80cec4283e48fafec0a3c1c1d30df

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