Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93db21fd38b1054…

MALICIOUS

PDF

87.2 KB Created: 2021-09-06 23:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 203727b05c12af64bb6606959296f08c SHA-1: 0f04206201708724ca1c291ad7b412e06f744a61 SHA-256: d93db21fd38b105437efc0dfe033ab34b0680d21c265233514e099bb5bdef5cf
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous links pointing to potentially compromised websites, indicating a link farm or redirection mechanism. The PDF structure and embedded links suggest it's used to direct users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://immobiliaresancarlotrieste.it/file/lojowidixawexaxukifep.pdf In PDF document text
    • http://poddertradingandindustries.com/userfiles/file/riponapajizitusirate.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/484p4vjb48pcsfdk8005mj2nbe/37058610204.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df21c52d4c---ravesojamaw.pdfIn PDF document text
    • http://mamsongdamchoi.com/images/chua-phan-loai/files/xumivajoge.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/197393963.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/5d9a7da93d43eef86629ac84ff6aba05/30075196695.pdfIn PDF document text
    • http://dzbnf.com/upload/file///bizuvore.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/nuzamomidonij.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/rorazoseturabuduvilileno.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/68800012047.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/xefadazaripoxumerulobonil.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/51777232464.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/31893958552.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/mominerijobisojez.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160dceacf17725---gatugorapitobev.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/kisevimavofagiwatofavifab.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/gejed.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/2ec48d4d2061c25ce85f8c50b22b5a30/xokaxapaminogumubibegos.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/vovexaxujodaboxaweti.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/9372254711.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/nadiwugobobezajawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=fuji+xt3+manuale+italianoPDF 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_off0000eca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 10480 bytes
SHA-256: 01564775b7b7400202b46fb0d9c2b5bfb0b585a97ee913572d39bb2bd58cdc9e
font_02_sfnt_off00011c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C75 19632 bytes
SHA-256: 0123d1dca5af964578e4851f6df5323543ee701628e6b1d27a5c6e5d6c51c625

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