Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf8f139349a3231…

MALICIOUS

PDF

85.3 KB Created: 2021-09-01 07:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 59a9c6263cde3dbc4ce37ad5cde25eee SHA-1: 8f349d4bb46a8e6cbd24b10f37c207a43e388abe SHA-256: 4bf8f139349a3231a7723cd1d36a93e169e9c707bd63a4f59be5491d1c804cf3
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs are likely part of this scheme to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16119c8c08b063---fapaxutojaguk.pdf In PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/rotik.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/0vuiqlp89u70jb9f4h0gs2qnhi/kolavaf.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/subiletunarini.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae68da9b55---pifakejujikatolajafe.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/90308843367.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/7489778113.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/toburubunurik.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16091d5a37bb29---xupezibesinagatovel.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/58dcddd4066a4dbe4ebe649207567b29/42987253676.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107252ad89c9---43103431833.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/rabazij.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/39144109657.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ce027c683---funulalemanefukedix.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210813192646.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/97079849820.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/179e97e012271a616a750d087de66918/90904765273.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45340991118.pdfIn PDF document text
    • http://www.emailposte.com/pictures/wepiguxiregul.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/4684a79a3d483a76ffdc2d659d242709/wivoxikenakoxozogo.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/brrkqh3a24lmgpkft6s3rudrcp/vunegigobotiguwumikixaku.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/depeg.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/fivaden.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/bawaxumujizig.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16071df1a2e5d2---xesumebatavos.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/8785urltm81tk16cpuu9u1bff2/94851217782.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/61778095149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=extraction+of+crude+metal+from+concentrated+ore+class+12PDF 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_off0000e57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57C 18272 bytes
SHA-256: 00c5dc0ad3f0549a62c1723170a6088baa13bf8aac668e5f7b1e8265f0bf446c
font_01_sfnt_off0001144b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144B 10996 bytes
SHA-256: 8bb06aa88fa66ebdd77e054b8faaaa289c2164c879c119ecd6f9dc3a60536d7e
font_02_sfnt_off00012df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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