Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8d7f12c4cc29f0…

MALICIOUS

PDF

80.0 KB Created: 2021-09-04 07:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6f95c6de2b30119ce64e4a5984c83e25 SHA-1: 6be796742f5b88dfaadaa6298c69a43026ac3014 SHA-256: dd8d7f12c4cc29f03c80de0172ffffdc715f91b36c06f560083ab628fc6452cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely involving the exploitation of PDF viewers or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pikhospital.com/ck_uploads/uploads/files/57114743343.pdf In PDF document text
    • http://jandenzobv.com/image_uploads/file/82272427239.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160875a6931505---xupawuzima.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/dirudevuger.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/24017606927.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/xujiponexobote.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/2356cca8fb2bb7fbfc19686b4d097366/penikozaxunazusemofogades.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/366b8bc8222765c55026e792c5692e2e/vawazi.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/vokazaz.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/gupagado.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/kebigupewuvovasiwelazone.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865499bd4b1---10093735370.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/14838793383.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/41e5d8ed98d2b6b9ef22c72cc17921b2/kowezubudedesuw.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/lipefejuvoparijifimupevif.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/35353031025.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/vokukowu.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/58124920500.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/lemigebinifujeji.pdfIn PDF document text
    • http://uco-kampen.com/media/files/dusixapudubivegu.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/dcd046defdbf9bfecbc30ec1c0886bad/xuzojasejepafuvevonowoto.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/72598110388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hemorrhoid+patient+education+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/67a63255e8a223ee6023646aa65da36d/noludukumudinep.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_off0000d528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD528 10760 bytes
SHA-256: 99df74ed6db938f38c87381064e9d3047630fa039b79d73218696961263532c4
font_01_sfnt_off0000eda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B7 17300 bytes
SHA-256: 9f1b3262b9afaf074516c70e1cac7f73eb82f72073b3c39126006799c781a828

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