Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b05595e190694bb…

MALICIOUS

PDF

75.0 KB Created: 2021-09-17 17:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7d12b1e02436ce818b271486405159c1 SHA-1: c9247c6f37b8732764dd9a49a1ae16491edba393 SHA-256: 5b05595e190694bbb249c077bb24ba5f9e46610cf63a4259555428706c9ff72d
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead the user to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/davc9lo86pm919jbdg1ii61b74/79092139407.pdf In PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/54297901569.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612fec4364369---97586906062.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/34393686817.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/fosemevidami.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/e1fa69e7affbdecce86f3d9590c49294/52447825143.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16131489a7937e---80980717147.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/23981047879.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109160607191350.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/2eh658tj5f8hngjoo0or1298le/78796258158.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/tubefovakarerimom.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/85350340195.pdfIn PDF document text
    • http://bptramptour.pl/files/file/siwokumivaribokitev.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614352956c13f---64597173427.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/duzozalinisogodis.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/33040233563.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/tasajipumogi.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/15917398315.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/ketepuwazakagasekizu.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/3859688651.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/xomikevidawigas.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/pimur.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/mavemusakuvatut.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/lakurusipitutege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=redmi+note+9+image+stabilizationPDF 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_off0000be6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6C 17936 bytes
SHA-256: f8418b83d5cba603970f84bf806c2061d84df5715e643ffa025ed454735f7aea
font_01_sfnt_off0000ed4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10564 10904 bytes
SHA-256: 0de4f7bb1bedd7b079bab1079e76c7656d0185aeb7bec7158e7291ba8a7aeaf5