Malicious PDF — malware analysis report

Static analysis result for SHA-256 194bb9be3af6f0fc…

MALICIOUS

PDF

90.5 KB Created: 2021-09-05 08:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 205f02660ea5f309be6d1929de6d572a SHA-1: 8ab13ef540dd1413211fc67de9cd94d1617fe932 SHA-256: 194bb9be3af6f0fc355509a889d62dc2be557f86c5c346a3e5b9feb358c24f3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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://gapoom.com/upload/fckeditor/file/lurot.pdf In PDF document text
    • http://amirafouad.com/uploaded_files/file/92440436362.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160837e69d7dad---bipivazog.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/vulub.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/0senmgio3k06jshbjfmg1b9fuh/79282323207.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/gimop.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26885726940.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/mizifebupevataraj.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/kudezojuponabejokuvaguz.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/wukalinenexuburib.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092044908637---90948565931.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5dd99ba7f03389c491e8c5170109778f/884968003.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/16a8c165de252fc9f4faa0579614b8cc/popabawewewijipebevafiti.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b491de18ec1---mokotoxugi.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/51695775464.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/kijuwefi.pdfIn PDF document text
    • https://capecoralliving.com/media/file/kezuwo.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/vigozoperadi.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/1022024337.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/pukefukizifozikavawem.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/xamewigeximajekalukalufab.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/c2424e932a106df6f8b5254930e551f0/vipebifobiba.pdfIn PDF document text
    • https://bselink.com/userfiles/file/gusukitu.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/30434308696.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/d93f0553273667ae36fc96537ee588a6/wibesogiserilabomeke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=study+skills+techniques+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_off0000fdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF1 10864 bytes
SHA-256: 88027ef174b1ccde89af1c1fb9612a24ba70787f88f7d8b5d5ce751ba82e2beb
font_01_sfnt_off000116bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BF 17648 bytes
SHA-256: b7be0581e60b3dc43a32d84643955400eea465f971970a54571d58d4b162ddaa
font_02_sfnt_off00014420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14420 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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