Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f3683b8e6103c2…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 02:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0abf8e37b32e7ff900c6a82490aa6fa6 SHA-1: 1a60b1ed02c49651718fedb86b5e0e4a16f2ea5a SHA-256: b9f3683b8e6103c290f9e8c08c01ad75b4c882f6068610aaa7572b59b280b90c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jagodkaprzedszkole.pl/userfiles/file/zujagibawo.pdf In PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/m00lrc76teucnk6knjbcen81m4/16518545602.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/lokotobopusemazuwevasipa.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/613eded3b7e763898fabaf4187fc2308/wudanegajosu.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/39637045679.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/joxugavibijevorupalexava.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7ab6d8e63d2a5a216ebb065c3100b088/jitoxudobeti.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/ketujozakedunuvagiwuzad.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/66458944209.pdfIn PDF document text
    • https://intersat.lv/files/file/pamarefidewerekatorafidaz.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/jiwilozibabu.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/73491941403.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/2612b10aba67d1854e9bdfc471378d4c/ferefinesemerilejak.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/riporipububusizilisibefun.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/xijirevawekipaxubekid.pdfIn PDF document text
    • https://thietbigas.net/media/files/risokejuzodarazopeketib.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/vuzebebodo.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/tazejopevalop.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/vupepoverim.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/8983346817.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/50257686274.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f98783a620---nitowov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ppsspp+gold+exePDF 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_off0000e8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AC 10112 bytes
SHA-256: 7f41196aaeb8e7d99ee95a74d4c0ec23cded8760d0040a96e2ae6a6f7fc27db3
font_01_sfnt_off0000ff1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 18256 bytes
SHA-256: 50ea8a250a4ecfc54168c5079d7df8aeca712630f656af7983d11ab423ef9ea5
font_02_sfnt_off00012f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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