Malicious PDF — malware analysis report

Static analysis result for SHA-256 4904a8cdaee6ada4…

MALICIOUS

PDF

84.6 KB Created: 2021-09-13 20:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e7ab9c6615c027bc60cfb6b5ca008f88 SHA-1: 4bfbd0c1f9c43ecad28a1e496fdfc9c77f35e218 SHA-256: 4904a8cdaee6ada45d301392fe5b7ca5f690a9aeca63e71c9e6e7136b7d8ca1a
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and a link farm structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://fs-select.com/images/blog/file/zobulifivamamoxawupad.pdf In PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/f43bbe8bbac6042a3a950c69ac5e5186/49728923325.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/8566433252.pdfIn PDF document text
    • http://kmsenior.org/file/files/41663252718.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16135354fc9679---kagujijamujoworalijonejo.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210903105621.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/45133380665.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/21319742270.pdfIn PDF document text
    • http://cpviettin.com/upload/files/sidalozumabiwesubiwizidu.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/zawolabigofero.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161336ed1be373---91848492097.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/zenitaj.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/xopajigewenuruzixodufowid.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/gukipafu.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/sixivuvi.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/sawitixavowaluguxe.pdfIn PDF document text
    • https://rosycaffe.com/file/nexobavezedumolib.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1db866c51---47182562002.pdfIn PDF document text
    • http://ortosprendimai.lt/userfiles/file/walitiwefulixebiwosepasim.pdfIn PDF document text
    • https://polaria.cz/images/file/12754990393.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/86718690053.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/zidudixexebuvadimegip.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/zelifumemerewusitunitog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=watch+dragon+ball+z+superPDF 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_off0000e529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE529 17996 bytes
SHA-256: fc418d49e78721da587d9bbca57f37534a9a609aa686154a5342c859795aba53
font_01_sfnt_off0001135c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135C 10992 bytes
SHA-256: aa84aa8d53595e8825f852de6b8cd017d114e54602ddcc8d68cc93c964a19bcc
font_02_sfnt_off00012c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1