Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2f4f9b54573175…

MALICIOUS

PDF

77.9 KB Created: 2021-09-05 14:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d9493320a4ef731ec9be7c0780c3ecd SHA-1: 0f332b51abf787b9d2b799a5cb8c9926e0ba9ec4 SHA-256: ca2f4f9b54573175f97206199dc821cb680763b9396c7910d3b86216e29b8dbb
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination. The primary attack pattern involves redirecting users through these links, likely to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bem-sa.com/img/file/25569155814.pdf In PDF document text
    • http://jullien38.com/ressource/site-image/files/sazewabutizusofepawil.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/fadupatap.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/moxigepogiwo.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/rupojokuvetuwaze.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b26859d7---leraro.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/bexetegukogebefu.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/86c50c21e264e5e68a3f96741d7f1b6d/75313488405.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0972500b4---mefaxurubupakepadetaj.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/zopajekutalilipituwikofag.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c153005ae---3293511041.pdfIn PDF document text
    • http://rsst77.ru/upload/files/12265528027.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/u4b6ttncrd7put85es123tg1q5/manimebedudas.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991f7a6eff4---juxinenuwu.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/mozadar.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2dff6ac3b---73839921267.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608445ede7219---korebudorugaputaxi.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/121b0c893a507f6fb5efb7497de4ea42/fobadotebidezoze.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/bujoram.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/32231973337.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/9fede863c06292b4909d79f3e38af700/varideriv.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3eddb8c3d---84380634204.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/datowinezosofujaxutos.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/50186253522.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/26015067957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=chapter+25+acids+and+bases+worksheetPDF 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_off0000cbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC4 11168 bytes
SHA-256: 043af3e3c726781a8e3904a3687c085d517ffea8026fc1f8d5a632a05563c73c
font_01_sfnt_off0000e5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D0 16860 bytes
SHA-256: 86632853fb989098c00cdc1ec74c3ba94898d46deb0315001394d88403997560
font_02_sfnt_off00011102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11102 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1