Malicious PDF — malware analysis report

Static analysis result for SHA-256 606af60f1f630cc7…

MALICIOUS

PDF

185.1 KB Created: 2021-09-06 05:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5dd759e3cd9bf608036301eb2ef885b9 SHA-1: d0295c34ea885f006147f47ed6ebbfb0a0373a09 SHA-256: 606af60f1f630cc7cd18fc1377e3424bd09c73034cef51f3b7dedb7aa9fede80
156 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of links to other PDF files, many hosted on domains associated with compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malicious content or engaging in phishing. The presence of numerous external URIs and link farms points towards a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 http://asiavent.com/UserFiles/file///98649945699.pdf In PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608807b738b9c---lugelevofemujusefewufi.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/50214547828.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/99ul335osman1ufas2lbs6fiq3/wetuniwefugetojeta.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8a6a4d3d7---59552582466.pdfIn PDF document text
    • http://mousike.it/img_ins/files/zutajudi.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/22213433878.pdfIn PDF document text
    • http://mdtrend.hu/files/file/78826090751.pdfIn PDF document text
    • https://edusfera.pl/upload/file/tetewejirogixo.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098538083172---19339539362.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096889f4dbf7---degikekaxo.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dcd5c878e---1614348506.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff22bec296d---paxoki.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/bogaxovulisatokirimutofuw.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/39406981704.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bff274621c9---jujunelevomopimov.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021715225113952.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/xasabepanedadim.pdfIn PDF document text
    • https://projetovm.com/uploads/files/71526464652.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/nuzodanax.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/bavasagixufevajedawurokuv.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/62686091233.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/guzetimetesodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=intro+to+information+retrieval+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_off00027174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00028986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28986 20468 bytes
SHA-256: 185eaeee7a7c1b3112fd603dadd1510f8ef07fbd05e3276cdefeb4fa85030fa8
font_02_sfnt_off0002be6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BE6F 10508 bytes
SHA-256: e93e4076dac2881b91ea9fbf0dfc14b779ab1a6a43ad5749c7cc2e05e9d85ed4

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