Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2eb0df030885f2e…

MALICIOUS

PDF

81.0 KB Created: 2021-06-27 04:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ba828274801f97de08f712153140d9d4 SHA-1: 012b23901da57c786d169cb83b32b2b5a46ff6bf SHA-256: e2eb0df030885f2e7ba6f77a8dbbf3cb08168b83efcd5daa5a1de6995b9cd5df
156 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, specifically leveraging the 'formcraft' and 'super-forms' plugins for file uploads. The presence of these links suggests an attempt to redirect users to malicious or phishing content, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609882648a4d0---virasiwolopo.pdf In PDF document text
    • http://sake2metustin.com/uploads/files/63019849478.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092639597fb0---85783415956.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/g1tltnb93jqnn4s1bed950fo29/96821774794.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1b3a71b13---8472294738.pdfIn PDF document text
    • http://ridendo.cz/files/file/zagupivutikepikijasevokil.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/27315f9e28bb8d3f24f566e4d74e39ea/tukupimexalozag.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/22783927035.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/e7e7add216433a648ea0f5528d62728b/11890383454.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/830422d9e59efed509193c3009909b06/35056722309.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210524185954481.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/04bce46d482e06edf517a768ba9a7772/zigagagokozatu.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/38737111178.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d59e047fb---senamazazopekumubiril.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/goruz.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/k333j272o38pm7jv7h2rduf6g4/40373084978.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7e41fe6b22702704f8343c472e5724e3/tiroriwitavizuzuw.pdfIn PDF document text
    • https://clinicscrm.com/img/files/24994621356.pdfIn PDF document text
    • http://fxmeat.com/upload/file/3520903ca5c49266ca68163e5bf0c3a6.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080296e0f975---wekotifozusesobizuveman.pdfIn PDF document text
    • https://susta.vn/userfiles/file/73387456534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=living+a+fasted+life+by+kenneth+haginPDF 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_off0000d9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F6 10784 bytes
SHA-256: 9c9f7b582d4d66fa5fdbe8ef519ced0352a5031ef9f0883647d83039a160205d
font_01_sfnt_off0000f286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF286 16984 bytes
SHA-256: cfd1c9e4a9621b03e4770033618b8dc8221a524a47fccc7aff116d78d2a63b87
font_02_sfnt_off00011ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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