Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6ba2c37e2b725c9…

MALICIOUS

PDF

82.0 KB Created: 2021-09-08 15:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: feea6581fb870c8656628d3bd8e10aa4 SHA-1: f1f8d5ad832e5ef1e8516dcade4a53f6f22219d9 SHA-256: e6ba2c37e2b725c9442c23551c8985e067446d277bd09ce8b34c7ec57f3c32cd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF link farm heuristics and external URI firings strongly supports the conclusion that this PDF is intended to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://irlanc.ru/uplcv?utm_term=ctet+paper+1+syllabus+2019+pdf+download PDF link annotation
    • https://armenia4d.com/contents/files/90489532620.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/54581088850.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/tumesabisolukodovexazar.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/86714015227.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/a2e8484196a564b52369d9df0ef23d24.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/wuwarutegomolugevebimasu.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/gakerudifeg.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/febekunokigox.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/6f2f2da8bad62764e2305067279edf6e/kaxabikorabigiwuvilafonol.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/miximi.pdfIn PDF document text
    • http://adice-area.com/pictures/files/88439348841.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/morajel.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/sedew.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/8h28e2osq2ohkju4peo3j37sp2/pasuzujodaromaveduk.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/xutoged.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/85038622269.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/womenozuril.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/f45dc8dfb05aba4b6b2da5ac55b90126/68949734279.pdfIn PDF document text
    • http://cobmedia.hu/include/sojipojebu.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/89021932318.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/kikigotojewujuburubesepor.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/49170072641.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/1216337816.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/supomiwukegejofeki.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/43813345284.pdfIn 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
    • 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_off0000d8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C5 17812 bytes
SHA-256: a3e5016b1fa0ff4cb1ff8623cc06e546d5a9946c80b2608bd3a0e6e4ba1b5281
font_01_sfnt_off00010702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10702 11332 bytes
SHA-256: d720495408ecf026d1dcbf03b16c0749b08c2f501b5bb684e0fb34bb71683178
font_02_sfnt_off000121ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1