Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3bad379997a6530…

MALICIOUS

PDF

94.2 KB Created: 2021-08-07 03:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55810cd850f8ab83ee67c274fa9444f0 SHA-1: b1caff7c43a454af806033a4dba542e599c0773e SHA-256: a3bad379997a6530a7a4af2df6e798bd05a4d5268101c9cf6bf80f4bfec5dc3b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs, many of which are hosted on compromised CMS platforms or disposable domains. The primary purpose appears to be to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/4te3e61d8uopt7nhrh72gaduim/94738353854.pdf
    • http://hochrainer-elsner.at/upload/files/sujebivowagukefe.pdf
    • http://maivietnamesecotati.com/uploads/files/zigilozidazoxizalopip.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609541a0633b2---tebopupisaneduwenapaxave.pdf
    • https://aglogistics-bo.net/userfiles/file/wufujalojotivosenu.pdf
    • http://nenkin-t.com/upload_img/ck/files/zogowojezidevod.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/g4cqgnos22n3i11ie4vna5mhj1/23389122758.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bd69b727e---pagupibipomulejasulefu.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/39243065173.pdf
    • https://kisikana.hr/userfiles/file/votolivupuv.pdf
    • http://ahcxdq.com/uploads/file/30110716732.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/77c657d35467af7d599ef0d795b93121/danubasur.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16074d6fe021a9---zovaja.pdf
    • http://stark-tools.ru/images/uploaded/tevuxujabodesumobume.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aca0553f037---zoporazosinoj.pdf
    • http://areaengineeringsrl.eu/userfiles/files/pababolivabatixo.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ed092d37b---91313100304.pdf
    • http://bigband-ulm.de/userfiles/files/joxakazepizonodolaw.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f985d14828---fekozevukarawejizoneguloj.pdf
    • https://electroagro.es/pub/files/mamuxowanikopuxotuvokiwuw.pdf
    • https://psfund.org/public/uploads/files/cms_files/xodakipanez.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160869f6641761---makatebajarevitetosule.pdf
    • http://ajtoablakcentrum.com/_user/file/65204073950.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c666ca4514---fejaluf.pdf
    • https://creteotels.gr/FCKeditor/userimages/file/fesufubimu.pdf
    • https://electroagro.es/pub/files/tusezovuzuzamaxipifegared.pdf
    • https://daismene.it/file/tujadudikosatitokimudife.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=compound+interest+worksheets+with+answers+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bce.bin
c59ac695766802cdd49a9e27773d6028c6bb2de9ec663fc8500780026fc08074
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCE 17056 bytes
font_01_sfnt_off0001384e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1384E 16792 bytes
font_02_sfnt_off00015065.bin
4af91b7d7af37bbca3c9187c15e19a5a6487df478646b1ace4b313a02e9cd805
pdf-font-stream PDF embedded font (sfnt) at offset 0x15065 11024 bytes