Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1db898c089c315…

MALICIOUS

PDF

90.6 KB Created: 2021-09-07 00:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8bbee1b7013dbfe7288641268f0a5ede SHA-1: 684b1f2c80594de92e7e39b998d8124280fce8b5 SHA-256: 3f1db898c089c3155a1091cc15839154c1e827fbf7beb41d4388be30e99711e3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to numerous websites, many of which appear to be compromised WordPress installations used for hosting malicious PDFs. The primary attack pattern involves luring users to these sites via embedded links, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://krisoc.ru/uplcv?utm_term=cambio+climatico+mario+molina+libro+pdf PDF link annotation
    • https://isabellepieman.com/userfiles/file/tikedulijadogipazi.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/0e1fd63f262c1ea2a2bf3806d0a84df2/83225967426.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ef2b70060d---popapademefat.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9275c9b0b---nojilajaloful.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/5245606814.pdfIn PDF document text
    • https://ebooksweb.net/files/file/gatajapek.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/99479496961.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da73202335---16658128105.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/cfaf4b51a516f378044d838b0f3539fa/1427086803.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a97acc7dbca---12019680507.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/85af3134a1428e1b618ba8aa2450cf39/redemuzobubefilegemet.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210724044135.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/gometidalavetamefusukolet.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/30411108828.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/93898209765.pdfIn PDF document text
    • http://tercovci.cz/files/file/kixojawotiketupopalozosuv.pdfIn PDF document text
    • http://aifamilyreunion.com/clients/59202/File/kesilax.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/11577388699.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/kunegebo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8535d222ee89fc75052dcca02e76f115/40046492323.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/81419607863.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/53496400169.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/leresevozamewumotoxamube.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/pofaxunumevunetawomep.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb7782d053---ruwavimeji.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/hntfs6j4b1ev9uvo2f12vr1vje/kalotekabevulixegeka.pdfIn PDF document text
    • 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_off0000f8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EE 10652 bytes
SHA-256: d72c01aa3b28e456926892726be1ef91353148739fbf0c769785df87a44165e4
font_02_sfnt_off000128fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FE 19976 bytes
SHA-256: 0b58b1b85563281d940cc3d08d4695fbee53342994c714a834e5b105260082ef

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