Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c88a7a63d2f7443…

MALICIOUS

PDF

90.0 KB Created: 2021-08-27 20:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0637a183db1d5860c308acd1a545bd8d SHA-1: 2f9b152378391ab34ae553cc406ead4e9754eb3d SHA-256: 4c88a7a63d2f7443884eff568a2559137a62fef9e7685f1dab62ff524572e718
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm used to redirect users to malicious content. The presence of these compromised URLs indicates an attempt to leverage them for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fe08a096---18289333885.pdf In PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8c019c512---774705434.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/viwezemogixojaxexaw.pdfIn PDF document text
    • http://recrute.fr/files/files/96860691757.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/b03c78da6d1839c6b79ef2ff54957f32/vekabel.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ce5450539---56516008721.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/6urohmcntf2dr7lgo23behge10/witaxotaliderurosenetufa.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c5979aceac2---jenovejakowafasupuxeti.pdfIn PDF document text
    • http://katachizu.com/img/news/files/legutipowonigipi.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/a80ff7728d872cc04d5efae62047052b/zoreziwosiwu.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/99241469897.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/1487ba6d8c088e8f997dcca910ed5780/44964448524.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/35fadf7e22f545943f3f6b4ee2fc32fb/92253535164.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/89809416868.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/pagozaretim.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/94660387157.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b4f759819---88154504029.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/tunezuxodanas.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/seditujem.pdfIn PDF document text
    • http://mvpvo.ru/userfiles/file/43826050709.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/20588757963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=connected+glass+texture+pack+mcpePDF 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_off0000f3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD4 11088 bytes
SHA-256: f120f132a8706c042db3546637015d798a3680959001f1c559ee651e9e7b91e1
font_02_sfnt_off00012593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12593 19496 bytes
SHA-256: c9fd7a17a3dfbb6d021827d6c94b32f90f7e66cfaa74760650c6ba449f0a59cc

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