Malicious PDF — malware analysis report

Static analysis result for SHA-256 555b004ed10e9eb2…

MALICIOUS

PDF

85.6 KB Created: 2021-07-01 11:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1b629cb3861e47c13c0ced5f830a828b SHA-1: eb42e0d7a01560f0ea88cb4b74806ef3fa711c69 SHA-256: 555b004ed10e9eb270be4e0383bb4f3a29d97a7e4a182acfe59fe163a628b09a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as containing a link farm pointing to potentially compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious. While no scripts were directly extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/4528926de313c0aa978697b742dc3589/64926642929.pdf In PDF document text
    • http://siripanyalamphun.com/user_img/files/25304800093.pdfIn PDF document text
    • http://santeh.md/img/files/xulogivikugudojadipa.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/vk57q5tk140svlnkd8t92ln59b/10924938009.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/6cce886603f7bbf504423765cd42a0c8/9800097872.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/5aff81bae76ba1d1b474a0d1e65e7b4f/zazofike.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b95668db8c6---vifovirubiwawam.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751fdeb0099---41992530837.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-23/20210623021300678753.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c36fe5cbeb9---10374263051.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160786a0b5389e---julagipakasaf.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2b7703c36---11789507423.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/6439426976.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/1723412592.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/b9860b28c736b7a394a5a35d06680960/59418994928.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/vupezaratewabifupebo.pdfIn PDF document text
    • http://yjccnc.com/upload/files/20734194892.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/8305983985.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/bivujed.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/t72itqsoirfhg8v3vir45gifp4/sulexoxuzisivobam.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609183cfb8f6a---54532748174.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/gurivegariwipazo.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/e5de32a241120803f4864e036628d4a3/puzasenetimanov.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/ac337fa22d4cb8804c7c64880c74d7d6/83129623702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=automatic+to+manual+conversion+civicPDF 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_off0000f274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 14984 bytes
SHA-256: 40c92dc8ce75579a9146273babb755c500cbfc6c55d4230b18d36eefac29919e
font_01_sfnt_off00011896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11896 10540 bytes
SHA-256: 05038e7aeb5c57146fd7fba8727e39c092f33c7b9e9bcfacbf00c81a653f16fe
font_02_sfnt_off000130ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1