Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af0a3e9a6391b9f…

MALICIOUS

PDF

87.2 KB Created: 2021-07-13 03:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e694e5c71ed1785b6fda67477adda9db SHA-1: 7b7fd987cd4ac7f302ce10bdf232fe2ed621e91b SHA-256: 2af0a3e9a6391b9f976c4848c400cd2a94b373cbf28dc2e11de160c1fd94ec7b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 7

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=where+are+my+pdfs PDF link annotation
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a5d162ff3---6200609538.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/9e643c3f5c8912eda59314698b35d040/sofibidumisomemoxeninet.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/i45hkbanbm0thv6lf8cp7crfia/xidanudozaxesirukev.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/96362723198.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/8d6d1cedcb988f45fe933b545920907c/mezog.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/65514460493.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607999b771a8d---wanikuxonorog.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf934629d01---50437495233.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a290e0ab524---98181614212.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/48031413593.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/wiwofe.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712d23a46c7---bezenazur.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/4c16aa6ef5c1bf0b51560fcde4e8284e/74036391185.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/u4jcj5b9n9grmpt2vkb8nlbmmp/24738240361.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d992b37fc2---29917387743.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/c74b8abb4cc39bd5f9bbb02f9724ded5/dirapomirugamukola.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc90faa7ba---85399793010.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/56436832508.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/lejaduv.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/8b1d4ccc6f75dd67683650ca2f160f69/57578371973.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/99ecf2202c391b341964e0d2441d476c/74126878292.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9dbbb3968b---tevovujikasupuzulov.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91E 10408 bytes
SHA-256: 2bae65f7572ba17667a9e588d3fecf98f3195100ed7def01be68335e1e0a1d35
font_01_sfnt_off000100b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B6 17480 bytes
SHA-256: 9019baf1df17990489f852c5d3127e7e90639a0ce03bc7d8c74a315ca4e8e89b
font_02_sfnt_off00012e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001469f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1469F 1880 bytes
SHA-256: 4c5fe058ad75b60d556cb347c2914d1444ecd2fdcee349c16882b339a5bd6072

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