Malicious PDF — malware analysis report

Static analysis result for SHA-256 b613bc74509f621d…

MALICIOUS

PDF

95.6 KB Created: 2021-09-06 15:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 52ee67dc550525873075cb7152bd318c SHA-1: 0ff706404a8db0eff9bf51f0030e3f1d1076c115 SHA-256: b613bc74509f621dd6be8018ba35deed884c8ac224a7630a43a71409f60438b8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The file's structure and URL patterns are consistent with a link farm used to obscure the ultimate destination of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://pistant.ru/uplcv?utm_term=sunderkand+ramcharitmanas+pdf PDF link annotation
    • https://pensiuneavalentina.ro/app/webroot/file/46398701995.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/41357029145.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/35815106033.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/ba2298b0068d844790b84c7110604917/862171072.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16099208c8a1be---pofejatozelokulumiw.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/99371299765.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210830121807369.pdfIn PDF document text
    • https://wecareprogram.org/images/file/nebudotu.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/jufuzusatosuraxenowas.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/1c263ad6b35943f5f4c39dccb8f0a309/fasevuvenuwopote.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1624265661.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8c75ba90130cb6edc30cd1750cb6743/sisisetuzikaxupedesofu.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b1c0315e0---kosevuxebigerofemobofipo.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/7fe68cb2a4d04d9faa731f5b526e034b/nilaz.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/69351901954.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/f60f6ca4a8f06a324a429d82ae6e104b/zebidujojotasedepapa.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/xejizoranemefogogo.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161280758ce540---kuvexevubi.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/63483493376.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/zuvomoridetezudedanadozo.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/wowodedubuzopalalizejuf.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160872f3d68a6d---ruragolatadanuxofe.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/79509382914.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6E 10988 bytes
SHA-256: 94338170e8de61f7558531bd00c08e9151f4cc4b31fe4d7a09acfbe0e2cc8175
font_01_sfnt_off000116c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED1 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off000136c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C9 22156 bytes
SHA-256: 82b33ad70af7749375922d1869255be07bdbfc7480ea13e4a2e45aa60b4dd131