Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83b2c653dc22d86…

MALICIOUS

PDF

73.9 KB Created: 2021-09-21 18:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9f2a2f05324e2499ff2afa4ab900f727 SHA-1: 3be6e52fd0ed735563a865532c6d0b101cacdd97 SHA-256: e83b2c653dc22d86f88b9bb99de99dd6fa6a3edbdcff6c8e4ebb841f5ed60102
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://infrive.ru/uplcv?utm_term=san+andreas+gta+obb PDF link annotation
    • http://movitecnic.fr/ressource/site-image/files/89863712640.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347d7c1dc80---tajemoloreparefebizinig.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/6599822979.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/71682466877.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/86313880434.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/jijudobaropibab.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/jaluwojazuwixixiniz.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133c273285e6---sogokixatugegimagotifes.pdfIn PDF document text
    • http://st03.it/userfiles/files/1302427182.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/donupusesobetekufufu.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210905145505.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/momev.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/67988734694.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/rigaguzewef.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/12569128424.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/55178321639.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/46450076957.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/32003265533.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/fowupozinukotatosinos.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/35447190113.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/wiworuk.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/kupukaluzumatox.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/fazulat.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16147c5599d5c9---gudemapowe.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144815d5d54c---57692968079.pdfIn PDF document text
    • http://fgosvo.ru/files/files/judobaregijedulowanewenek.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_off0000bf0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0F 16576 bytes
SHA-256: 2b7a3664cbc2ae9fde79d37c12bdb2998a054f2856f5c7b6d404f59f2ae70f4c
font_01_sfnt_off0000e9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DA 10500 bytes
SHA-256: 35e067a066d2e7eda2a049a7b3f64b308ca46ce855fd276a5e3c43b9685ecaf0
font_02_sfnt_off000101a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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