Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e22a226fc83cb73…

MALICIOUS

PDF

75.0 KB Created: 2021-09-13 23:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5b36b95fffd4e1bc5010a2a0335dc28c SHA-1: 913580a922c5213a529b5576f590c8bd02def885 SHA-256: 4e22a226fc83cb73f07e57e33180aabbc827620874cf0b42a0a8ea7a2dcdb5d5
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are part of a link farm hosted on disposable domains. The presence of these links suggests the document's primary purpose is to redirect users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://wastran.ru/uplcv?utm_term=free+download+robbery+bob+mod+apk PDF link annotation
    • http://sarljarry.fr/userfiles/file/49328377377.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/jevogideteroz.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/wirowogujido.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/72480076992.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/13250988142.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/23732762572.pdfIn PDF document text
    • https://equalland.com/uploads/File/fisusujijupozezofivawug.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/tawerumajojum.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/sozaxidisufevaxidejijegov.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/1394764543.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/099ceadca23ca6a13338f7bb4987baa0/regivebeboroluvojoreduxa.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/a1f87ce646dfde338506d27f3d032a23/97719016052.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/94847524024.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/70599622715.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/fugizaxomarovibarebowaxu.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/5e2467fe4157f7f1d77cf015dd79f506/zevesavu.pdfIn PDF document text
    • https://kaparatt.com/images/File/farobufu.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/b4205a930662753c679f1590e1330960/38979116458.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/17038260988.pdfIn PDF document text
    • https://gdaniec.com/upload/files/bevakowixadikupemoro.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/zofifevobef.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/vonatifapi.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/vipufifapopapow.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137ae8f5b1f0---39923723577.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/89muie42gqemrpfpi17ceudkfn/46814078170.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/22489721018.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_off0000c28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28E 16928 bytes
SHA-256: e49655195a2f560340b64bd21a8f12419b14f436cc92efedbea5d248444dd98d
font_01_sfnt_off0000edcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E3 10604 bytes
SHA-256: dad2b40e57f7d50ddb6ef1f76ba6873804232b03ae13c091014ab03910a11c7a

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