Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b449384ed0aa513…

MALICIOUS

PDF

107.5 KB Created: 2021-07-20 05:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00a665cb0d7c07ec365f6bd82f32ba58 SHA-1: b36642a25b22885040cd4d7849c09528297758a7 SHA-256: 9b449384ed0aa51371b6f804e2708538ac2dc2ce45a39fd78f9a13c0ce5fe2be
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites, likely intended to host and distribute further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an effort to evade detection and maintain persistence for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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 http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/fad3abea0466ab6b01dc5ccdc79ddd41/bejafuribesuzuvudalerina.pdf In PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f5e526874---sitibadamarumeso.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/saxejutixelaletorabevadup.pdfIn PDF document text
    • http://xsjprinter.com/d/files/68169604375.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a80970ed2f---jujaduzewag.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/851de403c5172da08f880479f45a0b94/bakupiremedirura.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/sidap.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/gaduwakomezenebefir.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5088942c68---mikinidavevosu.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/cgiobu1343ukb53l6djb6fbiu1/semelasule.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/2268926403.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/vevowilaloke.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/26795184962.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/af2f26c766007f608bc884054ee310bb/rororarunale.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ce4498be6---belibegolobejusakuxo.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210624020601.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b2f3133b5---52246134244.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/jimejir.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/xigojagox.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/73033470030.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/59941611763.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/pizime.pdfIn PDF document text
    • http://edgecs.net/documents/xuwojunekapibalisividuso.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c12a66b63aeec1efd74981006ed5373c/fepinakuvutijigejefuzuwe.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/358245bf195795da667b4635be5d4042/dubuluwola.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/7a48296e89396f868296a38fb58bd7b4/22189448002.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9475a712c1---seritabokibumitijumudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=bengali+meaning+of+contaminationPDF 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_off00014504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14504 16148 bytes
SHA-256: c54150b9114e12bca6552cb87b30abd8666b9b3c5e80552837206040a58117f1
font_01_sfnt_off00016e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E6E 10464 bytes
SHA-256: 2fcc3e566990037955bdf0f6459ca01120a2bdfbfb294e78f377006f28c9208b
font_02_sfnt_off00018630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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