Malicious PDF — malware analysis report

Static analysis result for SHA-256 7807f7d9db4a956d…

MALICIOUS

PDF

70.6 KB Created: 2021-09-25 08:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bea6f0766f2ed9801110c297d93427ce SHA-1: 8dbe05f0f14e55391e7b3319c2365666014c4191 SHA-256: 7807f7d9db4a956d496047e9d0aedfa86fab5bd9e8ccf8e8c0f08aeae411995d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including links to external sites, some of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution document. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://chinahongji.com/d/files/36523518765.pdf In PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/zimilatewuziwirelog.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/422983a563ff853ecef942395831bf9b/giwaposutos.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cf276f054---30474919546.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/40262706980.pdfIn PDF document text
    • https://cecprint.com/images/file/13312175926.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/52415656047.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210910230105.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16131d2e4277a9---tujagoradanod.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/14063375643.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/61116837424.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/78754488656.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/mowifixodikoset.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/sivolerudefudoferukatojow.pdfPDF link annotation
    • http://zoldjogsi.hu/uploads/files/31204137362.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/4204942335.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/68644629218.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/69789929397.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210910_1607D71327DE1F1D.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/zemokakafo.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/xexejakubisun.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/moverebukufejipamirebur.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/27514094136.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/punudidatipewajomamuwe.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/73282021210.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210919081858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=simple+rocket+2+apkPDF 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_off0000b455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB455 16080 bytes
SHA-256: e1091ba157c0840f23109c98909f17ba80d000daf6b657401e78ab96922f0423
font_01_sfnt_off0000dc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF478 10548 bytes
SHA-256: 57c708d22c6dda5827629628c51baf2d142164cb22a37519e49a181586113022

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