Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c33298e0d548c6d…

MALICIOUS

PDF

93.7 KB Created: 2021-09-08 04:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 455d9b0b6c782c386f64a34a4b3d2c1f SHA-1: d993f4a71462249c9edd5e6b9347fb8209bc9426 SHA-256: 0c33298e0d548c6dbf817b011e1a159b95180375ae6b1bf7657a6dd6545eb60e
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The presence of a 'download button' lure and numerous links pointing to compromised CMS uploads and disposable hosting suggests a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, preventing a deeper analysis of its specific content or intent beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://travelsi.ru/ckfinder/userfiles/files/84552236288.pdf In PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/392902dfca7884143755f5d42622bc71/fiwapej.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/68530513533.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/10178195074.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611993c78eee1---tasenib.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/31855152940.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/tapunaxatiremubikipujodav.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/98495887821.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/44854654193.pdfIn PDF document text
    • http://esistore.com/userfiles/file/nugolok.pdfIn PDF document text
    • https://melz-feu.ru/upload/6754643229.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40488b950a---ruked.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc5b377e62---xoridajarumasolexifu.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/91125153940.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/76166600265.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/63175135260.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/ec8e90e5916ea73dbeb96e5895ec3ec0/12101504554.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3800238c1---gokuxoletem.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833b6c3c5e5---fufuxojus.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2a69aa06c---99532093614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=june+month+current+affairs+2019+pdfPDF 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_off0000f4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF6 16620 bytes
SHA-256: d7a7dced6beac6b5ba41c367ea2fbe1e1408b36cdce45ca675342dd2e627117a
font_02_sfnt_off000137af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AF 18976 bytes
SHA-256: 463e08668e78552e4a5f07a6df522fe6929feb50994e49e32f8796421b8800b4

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