Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea75cb7a203db04…

MALICIOUS

PDF

88.4 KB Created: 2021-09-15 20:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c5c56e291992e6f2b32e324a92a1e4a2 SHA-1: 0f58a11160b49e25ea3b3720f6b1f566f618696d SHA-256: 5ea75cb7a203db045d7b2f1d85ccedf76839cdfeada8c9c333f56e4aa7df876f
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload storage locations and disposable hosting sites. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to redirect users, suggesting an attempt to lure victims to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://connectcontrol.net/files/userfiles/files/variduloxe.pdf In PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/15432194829.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/eefe99877e34af69c33e2c763b69b8f8/jopeb.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/51719430358.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-10/20210910225713430620.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/87921603505.pdfIn PDF document text
    • http://sbkf.org/files/files/19182358335.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/93979968573.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/83666692887.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/zudupigo.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fabd842e7---73797286105.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/vubematobi.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/pusipalijuvivixi.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/xadawegivaxofek.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/vufixorok.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/46684553249.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/20566830940.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/vuvatozilij.pdfIn PDF document text
    • http://fgosvo.ru/files/files/judobaregijedulowanewenek.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/85514280178.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/29552804910.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/vunibur.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a91e22a073---41447863465.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210914071602.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/ruguzopanenen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=android+audiotrack+example+streamPDF 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_off0000f478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8F 10948 bytes
SHA-256: 9019b4a3a770ff1e3360698eee337e8f21e97ce3b5bf047873d75ada5dcb5ac9
font_02_sfnt_off000125f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F5 17104 bytes
SHA-256: c1eb5593994003c91e7288becb9b67ab5eb165c074c4aa43b1a1e56044f17ecb