Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9280f2570b53640…

MALICIOUS

PDF

112.6 KB Created: 2021-09-19 04:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 43eb5b05959a3f5ee0bf04fa448b1825 SHA-1: b5afab29694ccfe0b5d0744faa3128c1768c6278 SHA-256: e9280f2570b5364038694c0839319a1906b930f324c4cb1ac00376cda62323e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and a link farm pointing to multiple compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely serves to download and execute a second-stage payload, while the link farm aims to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/449b0bbac06e055c415ebbd7650acc26/38211536785.pdf In PDF document text
    • https://viettincapital.vn/upload/files/poferexajiwumirazudabe.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/susot.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/tadotenuzajet.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/kagut.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/6be475f6b2314723b7bf5dcbd50f70ef/26164689643.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/luwazonofuratativazimofu.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109130721423372.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/j4gti1ad5el2lhkqoq94gk0m3l/zawokukefesenitejadu.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/silijewupebawelitito.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/tanosatabi.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4f8508b8b---zikivuzebatuvuninir.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9cd61f67928d6aa728495cd62a64583b/69129213651.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/gidowelogog.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/jupobirejejufe.pdfIn PDF document text
    • http://homeopathyhk.com/files/1819898311.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/60718692670.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/64124148791.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/dirugiro.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/83301944049.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/18359523110.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/69954042236.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/91584339223.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/gupuridafedi.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/mivanufure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=space+jam+full+movie+free+englishPDF 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_off00014eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB4 19864 bytes
SHA-256: 29b36aa01a572f16c3a864c4b1d06ea56f43d5f523701166bce24abe5aac5c98
font_01_sfnt_off00018297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18297 11200 bytes
SHA-256: e8686831e3d2f753d510dd186fda14e7ee031c707d4c53af7e5c707c03949d8e
font_02_sfnt_off00019c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1