Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3b83f793c196de…

MALICIOUS

PDF

77.8 KB Created: 2021-09-04 00:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 02541c119a12a2332a3dbf5d818fbc36 SHA-1: b2f7f46172e2c2e908a651442487ab83f188c70e SHA-256: 0f3b83f793c196de74b2497d0aa958e7ec8039469a1f9ca6518e07bf781860ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://chemicalengineers.ie/images/ponunomisimovujutiziva.pdf In PDF document text
    • https://sona3elkhair.com/userfiles/file/fidujof.pdfIn PDF document text
    • http://rubensova16.cz/files/file/xabolebovimiru.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e480c77702---sedinovimawuxupowisuvux.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/20572312570.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c368dd31548---31553575466.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/lujimuti.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100af56de997---neweroz.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/gejejebopanibuluk.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/medideraligegegatuwaraga.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/gawodalelizasuposa.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/29763787383.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fde9150a97d---96336514595.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/bazami.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/89304734854.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/rega6kvqtpc7i4vrc7u14i0mhj/21721421495.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb31e0ae86---xebizodida.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/hula5kgohamlc4vqqkni13qg81/1168310741.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/6867291481.pdfIn PDF document text
    • http://cy2hand.com/userfiles/xisibubasafaxanepupu.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/84944516117.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/92595050918.pdfIn PDF document text
    • https://sona3elkhair.com/userfiles/file/95525281368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=sewing+machine+manuals+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAF 10824 bytes
SHA-256: 977c75d73fceaec1f3d45fc5470d7083b12df2907a37cd942bb27f670bd5b4a6
font_02_sfnt_off0000e774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE774 16712 bytes
SHA-256: cba39345d8156ea153060745f871c913d1b621c075179c4a751e642609d78c81
font_03_sfnt_off0001120c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120C 16540 bytes
SHA-256: e8486dda68d8266c598e955260788762e21e39567fd64c38d8391f70685452e0

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