Malicious PDF — malware analysis report

Static analysis result for SHA-256 1333273770ad8963…

MALICIOUS

PDF

92.9 KB Created: 2021-07-27 00:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 59651fd5cd63ea2e640db3603f4d663a SHA-1: acf0ff1577edd76531cf64a2753284d2dd94adcd SHA-256: 1333273770ad89637d6ca17cd4fa798cc71d6910f4c270ca9a4b1c2ce4da371d
194 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting domains, indicating an attempt to distribute further malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple external links suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9633

Heuristics 6

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/4256cd888442e0ad2a964da76f7a1bfe/xujenikogunixi.pdf In PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb1811796---81523247197.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/gafufepadedebaweronolov.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b978e099f42---fesurogedawed.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/45196658000.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb8a962f141---81050261385.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/lidelibusutovirulebaxijul.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac705ac03a5---55161685638.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f93fd58e94---jesujegadezurifojatojage.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/11123402285.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/64262530884.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085239066e2d---18012192664.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/320cfe970d84a11a128bce8e42eeea7b/95522837902.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/64dfc295f7537b6a5eb6b24c9a1e5224/97639041245.pdfIn PDF document text
    • https://bursac.net/userfiles/file/83790384696.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d8f09c343---xepekava.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/72923194193.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/dozibilusamozojej.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/popozova.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/05/files/210529134536.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/64465197498.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a66bde7bc---47607003030.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/ca797n4k729f8n02ncnrgulb8b/50775722561.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/womanafajetobokedup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=liste+des+verbes+forts+et+faibles+en+allemandPDF link annotation
    • 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_off00011621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E33 19376 bytes
SHA-256: 5362d9525cdc6aeafc56a2ed9864b515a7c3d32e928b00961e7dd9e7f9ba7e43
font_02_sfnt_off00015d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D1E 10676 bytes
SHA-256: b420160dfcab33bf88ed83bc2dd09d8a02268f94e61c3e7f7a9dfeccf5064d6f

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