Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4cbfdc6e7c3521b…

MALICIOUS

PDF

110.8 KB Created: 2021-06-28 06:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4ac45ba175b98c75b94623493ee2cc57 SHA-1: 23800e88ece16d93e496025db6fcbe77b26f7453 SHA-256: e4cbfdc6e7c3521bd42c49060e953bc0acb91f4f25d3562a58352876cdf39c5a
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to numerous compromised WordPress upload directories and disposable hosting sites. The primary goal appears to be to lure users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://hillsdalehorseboarding.com/ckfinder/userfiles/files/vovodupatadivexajabew.pdf In PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/4c804bebbfa55eb01bf9395beb4b6110/bosoferamesopokolobipi.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/cc41eedc1abf127a5caa3d75a9a03512/84569726661.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/bivolaxamefisotalubijige.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06989f265---natapuvegoso.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7cc15e2a4e76e461e7401ffe5fe38166/nitosa.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/43997248584.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/dqqtqp1up86pivnf2v73dp75rj/50637262400.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9eef838b2e---busesatimipid.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/24a9548519fa99ee3da0d070d9773b96/66088535121.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/93c7dd8b0d56f9bf4cc7acca70ae38db/kawipepelovidavatax.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bf22c811b---lijimud.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/jezusijukokoxezisup.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/5165ce3b3ede91a6b5e30006489e08d8/galapigofivifep.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee421e9ed9---62440036692.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/9u5qq52f8nohs3fgak20ahnom3/39041198703.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/ditaboxel.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/zowaguguvobexutimi.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/02923660edb5ae65e0d24145b7af1085/zumikoviwudad.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741b6c54d30---21785070538.pdfIn PDF document text
    • http://blatt-gruen.ch/files/gedokoxelabidujodo.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/48c5832e53f17f4716b8f0eca1d8de2d/pusivifuvogijawiviz.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0920833001620039695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=conduction+is+the+transfer+of+thermal+energy+between+particles+of+matter+that+arePDF 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_off000147e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E3 11536 bytes
SHA-256: 94b564e80128376cd4e30eb77389cb1c4e1bfd511b0ee25f5e624555023edc0b
font_01_sfnt_off000162b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162B5 18860 bytes
SHA-256: d99527427b71bc40b83783b869b944d643a0005879bbca9c872d5424ab91f75d
font_02_sfnt_off000194ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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