Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eb4217fe4692cb2…

MALICIOUS

PDF

73.0 KB Created: 2021-08-28 08:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b9d77c358b2378574a52f3ad4f874d0d SHA-1: 9f694046392d7cdb66012373153652a831a9dcd4 SHA-256: 6eb4217fe4692cb2290c8cb46b27172e1b4992f3acb8a188223161b7481bb084
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs pointing to external sites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially untrusted hosting suggests an attempt to obscure the final destination or leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://burragebrothers.net/demo/jolie/beta/userfiles/files/dusubola.pdf In PDF document text
    • http://munnarinfo.in/userfiles/file/86753826272.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/viwubomelaminaluzol.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/78utfk2fmg8v2od6j60h6bgsoi/pixedikorojifolomexuzem.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/25212279939.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/83941c21bbb607de579d40ac418aeb2f/1022280717.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611514ddd3ebb---40480595871.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/76215d0355982f08568268f0fbf2e892/bedigofodexobimav.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/14547152284.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe06c713cd---jejijisulowod.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/a6q0fi2r897outqpreo8l5q106/69439376100.pdfIn PDF document text
    • http://e-district.org/userfiles/file/ladakarukumam.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/zenovudizonusanuvumo.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/faeidgbuto9f959fs5b27qjahq/wofozidekuposubutakamalaf.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/taxufezezaturufevidemi.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/rarixadalolibipafifaxap.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/binigak.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/kavajaduwen.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/08a503041cbcb9bbaeca503d77b13ad2/kelenefalaxijuj.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/wataruvakazexewokeje.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/xakisefarage.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/bewiwosapujonivugibigawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=bootstrap+3+themesPDF 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_off0000becb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DD 15416 bytes
SHA-256: b0a5a69c5a775b48d22d1d7f859f1996af6abeccd3c7ab294479ab0dc31f3004
font_02_sfnt_off0000fe5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5B 10500 bytes
SHA-256: 2d233afdd8e7c1d56eb6d3b8d337136d5ce803b534e29c02548e73244a57f2e9

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