Malicious PDF — malware analysis report

Static analysis result for SHA-256 596b3135e8649b25…

MALICIOUS

PDF

97.4 KB Created: 2021-08-06 07:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 89938bc9ffcdb3b5d04c1f830f0463d8 SHA-1: 636cf14bad9b3f1618bf48e39fa37fbd9d72cb58 SHA-256: 596b3135e8649b2507a378d235c626c3f3d19cdb5bfbb3d729c56127f9cda312
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The embedded URLs suggest an attempt to distribute further malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/5q07dcca4net7hk2354fesu3gb/tuduritoropanamuta.pdf In PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/58301e0985984c34d1759ee6379537d4/14219522291.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f7tsk4rtvdm2o2a0v10ipcuiv5/fewujelolemivikotokigal.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/85482190457.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/1c6c600039e43d4a743d4a4da3ae543e/46739032561.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/82p9ijj1pnthssgcpv7puilch2/raxeketalovetezedes.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a566eaac5a2---sunofebukipisudowi.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/55164328445.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/92074037305.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/13344358309.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/mexelunobu.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/0934rnh016v0v6gbo2an82shcf/tasozipenaz.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f533cb8f98---99962230965.pdfIn PDF document text
    • https://epos.nu/ckfinder/userfiles/files/mivelevuzufubamenot.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/pixifixazemegegodej.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/6ehfdk9ahqi54ved3vehr67s73/betowovexevu.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/d5f2fc9684ea7cc5da49c1afad74b41a/93344706040.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/gudot.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/mivojarogig.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3bb2ea61f---35179375842.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210721044620408.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/c522f466a70cac1efb2233cecbcd9111/zerogekawupamaxafoxuwarod.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/47580339617.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/wefilubuduwilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=reduccion+de+terminos+semejantes+con+parentesis+ejerciciosPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF370 1624 bytes
SHA-256: 59142d9e3131d10ff105e67ae7a58fd8a3c70134eb981fd23033266bbf91d58a
font_01_sfnt_off0000fc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC27 10904 bytes
SHA-256: 48e36f355e52677ba8f392e792920ce156d89276f1e48018c92561e32f28702a
font_02_sfnt_off00011558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11558 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_03_sfnt_off00012a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001429f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1429F 19160 bytes
SHA-256: 39b534f134e0d309673ff55d3482dc76a53bec76146c69dcf552a8157636dac7

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