Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a93f39c7b5209e3…

MALICIOUS

PDF

71.7 KB Created: 2021-09-25 03:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0766aa2b4875545a0c87196342114f44 SHA-1: aa1a5e6c45a3ddf6577c7b714f4c0603af54bb64 SHA-256: 5a93f39c7b5209e3704da0f3828cbe6becce62a79c0f3e0bb435652ae7af2cc5
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to potentially compromised websites and disposable hosting, characteristic of a link farm used for SEO poisoning or phishing campaigns. No scripts were extracted, but the structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://f-okinawa.com/img/tmp/file/fasusibu.pdf In PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • http://www.lnk-creation.fr/upload/file/vuziban.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/78418893117.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/4043889659.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/522829519.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd3e0edacd---1747768542.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/82929673083.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puravaroranugipepanoro.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109130744512309.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/24876874384.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614198c9abe2e---fazedezupapexotisawaxe.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/51971695659.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/kuwunokibilemidirolagad.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140693f03cce---lululefunupoguwepu.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/pezavesodizofi.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/rujatulorojexevovewog.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/75834823925.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd5c3766ee---98545072404.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/95574733035.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/kimidokamuvumugafizilikib.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/56157174348.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/62632230342.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/57085575036.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/97078723780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=kimetsu+no+yaiba+mugen+train+streaming+eng+subPDF 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_off0000b46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46A 16444 bytes
SHA-256: 6f8d1d82eefc04483c912d1079b12060460cc3f064369a6a136b3046629d24d4
font_01_sfnt_off0000de40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF657 10752 bytes
SHA-256: f1344dbc1fe1c735281182a5c9c536b623925bffcdb59c2f6859adee9af012e4

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