Malicious PDF — malware analysis report

Static analysis result for SHA-256 a543700cf81e4c7f…

MALICIOUS

PDF

90.6 KB Created: 2021-07-04 23:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7e3c1e0ff0dd55f1886a3c1a6f029fa5 SHA-1: e43d0dff4c6dbfa63eb96ab471233b938916b333 SHA-256: a543700cf81e4c7f96931711a16601e25a5f7ba6a32eeb7028aa70e4ecefa1f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=the+7+i+am+statements+in+john PDF link annotation
    • http://fenotropil.ru/userfiles/file/52523921699.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/mk42am56kk63mo1nh1jg2n9gvh/14799385027.pdfIn PDF document text
    • https://signika.pl/Upload/file/buronegerawod.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca31abbf0---62053032874.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/v3r65fikabl18pg0al8fagb770/zepuditavaribujip.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021061809560880554.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/svrnaalk74gnrl8aun91geck00/11079420714.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b93c02fc2c---72304734622.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/61528744583.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/947adfa040d8cbb7886246fd8148563c/2541979505.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/lemumixifenibumesojufu.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/24857428399.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/efb259dc822df7eae260f6bd1d75e022/96136602953.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886015b86d2---17666112466.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3a6874106f69d48bff6c2fe612def0fa/lituvunogiwemoran.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e005268829---vatuk.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/4kvbn9fe9jv0ggupfm2ao48gj5/naxedibezove.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/e0b7d82aff3aedddb91cc840bc02fb2a/45343689191.pdfIn PDF document text
    • https://protrialse.eu/files/files/xavotetupagewelofinurilob.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d7364ab38---zosibita.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c65ba3413b3---57857090657.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/saxaxazesufeloputipasute.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/efqbl6e8hceafhv1etob6qfpe7/vuruweditotarajisi.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/qlad9du8gsj1ir6dbjjlg6itnm/butivarev.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072736645a66---goferagoderer.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_off00010130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10130 10372 bytes
SHA-256: e1bd72d8397ad6d4bcc9ace7ee35b3687a8a41f510b6b5012599264adcb371ad
font_01_sfnt_off0001187b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187B 17068 bytes
SHA-256: 1c145d9b40f42a910a894b602da7cf207565649a90a6449145019dc41375170e
font_02_sfnt_off000144d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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