Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef130bd5ef680a06…

MALICIOUS

PDF

78.1 KB Created: 2021-09-06 23:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d4ae7eab15383905dbeb55d72b005bf3 SHA-1: 1beeef08bd14b74e7096d6f18f7d2dfb67014796 SHA-256: ef130bd5ef680a060865f6483cf96ae0baa0c089260084723ef95c1eafbcfe74
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on compromised WordPress sites, which likely serve as a link farm to direct users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607baf2f15cbb---32661560609.pdf In PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/losodonixajodixaguxa.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/zuloterepewagamojiti.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/26324851277.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/0e826d017140bbba07417f3eb36304e3/4795675602.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/1628857088.pdfIn PDF document text
    • http://hrudolf.com/userfiles/57236068950.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/sanemubosadaxezumakorux.pdfIn PDF document text
    • http://vo23.ru/upload/file/fajuwumipaba.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/gizezi.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/73049129743.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a42025e4f93---66794874765.pdfIn PDF document text
    • http://iltorg.ru/upload/file/siwus.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/28b1b91d72c3a2b223242ad369614db6/54807945714.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5e313c7f5---potinepedujuzejutabom.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/pemotakawojalolujigutuse.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/73196881667.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c50d07480ea---nanosororiroruwenojax.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/25091606994.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/modikogamafutotokilub.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/dc09c1ebc58ca811d6090d49e6a2043e/lezagigugokoket.pdfIn PDF document text
    • https://derfo.info/resimler/files/xojalisu.pdfIn PDF document text
    • http://allasclub.com/campannas/file/jefetaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=comparative+embryology+evolution+worksheetPDF 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_off0000cbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFA 17308 bytes
SHA-256: d7eaa502803f4c7a0b56c062c790738660e219626de0427212deec3cefa2f49b
font_01_sfnt_off0000f829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF829 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11040 11328 bytes
SHA-256: 0ab58d6867ce362a12d2d8a38277b16d2bdaf77775aac17c5f2fabb662388403

Open this report in the interactive analyzer, or submit your own file for analysis.