Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4a757c276303fc…

MALICIOUS

PDF

97.8 KB Created: 2021-08-02 08:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7ee168839444eab8b4daac7fa8f15511 SHA-1: 923a0f8bd251f5b1fb6aff5b08285bae9f63b096 SHA-256: 5b4a757c276303fc22bb52bfd06abecbb93b097072414a64f954cb0b940e55e3
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains multiple links pointing to compromised WordPress uploads and algorithmically generated URLs, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The primary attack pattern involves luring the user to download a file from a compromised domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/e922cec04f7f410f3e2e14b7efd88e98/9566761908.pdf In PDF document text
    • http://rld-carbon.ru/file/31349754680.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/41781391286eedbd27cb4615f867087b/kosomakolifuweboforu.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/b242c884aa7f01d9a9ce8d58a7b94cc4/xegare.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/6ef5a74f51187249fb4338b9cba19c23/74048596755.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/zexokejolegekezono.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/o6tnqu1nj15kbc8c3ii7nb5emk/52425351828.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/tdjsrms6t1eep08pasj1c8ea85/44078812760.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/347256bcf69992958be52e5a83f3cc30/xadinigidabikonatano.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/tedisurijeta.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/wokafewoxoziwuwuxuj.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/82091983484.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/ou6igvmdmiq97kvesa2vjeevp2/kegelopokixibakutetus.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/a5537daaa71ddd71668c26d654cecd80/xuvoseweregumofabebepewu.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/88338602412.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607debf996e60---zanetigojesumeji.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jigonekonomad.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/93613791684.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/40092046840.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/fomalanenedurume.pdfIn PDF document text
    • https://areicon.com/images/file/xisawitudajugisonam.pdfIn PDF document text
    • https://bem-sa.com/img/file/15403814923.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/45173998795.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/b18a1664b7be3df5510b506a8f859b33/ronodagibuvuvojubijofub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=do+dickies+pants+run+smallPDF 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_off00011a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A57 10868 bytes
SHA-256: 6c67c2243c5be7e8ed038a2b9e71be53a1483bf0892518b5db5cef3be9ffb566
font_01_sfnt_off00013377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B89 17740 bytes
SHA-256: f04ad9473a901ffeb876207c52c7b87384c24ab20c9917437de0dc541fb5bb9c

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