Malicious PDF — malware analysis report

Static analysis result for SHA-256 948e1eeadb341701…

MALICIOUS

PDF

112.9 KB Created: 2021-09-04 14:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 15f60adcbc95dfe90131ee5495edffad SHA-1: d82c6f42efe663b76b1a86c2ac91bfe8203d2322 SHA-256: 948e1eeadb341701548a733faeb4da04b2a36431bfcf81837e1941f8ca468feb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to PDF files hosted on compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/dc53f0953cb8bfd3c848fbcda01645ea/53113486177.pdf In PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e41a1b079bc---judaruvifasuxeze.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/pexeduvulixamibezuxutes.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/jopuzuta.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/8mmjac3c8l7vfmm3q92g854jsv/43781905799.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/93299958365.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/72351890466.pdfIn PDF document text
    • http://kleiberit.ru/files/file/wadovisoduramunogeseraxuw.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/63101456853.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210718/file/16265671411692.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lepalawutesedexubeti.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/zipogo.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/77299867779.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/qe8o695hu1n3kci3cnmd59o374/xidezitetosabepo.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf44605ea7---diwazizibarafukutoju.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/qs89fe08lqj2lr80u581b331hc/54892939687.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/rixetozekogurakowosaj.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/18607650199.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/18319146474.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb27115baf---95714820661.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/ac345441d34f7bd5948ee63543a5ec17/96351123150.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/2855cadb2a64459692499c219009c7ec/20111378034.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a14f05d2ff4---88424434148.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/n08ncbhg8kgauav214908j8e76/vewurexafume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=common+core+state+standards+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_off00015342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15342 19048 bytes
SHA-256: acb52fabb71f368ad398f0c67226e24fa652349a0a93687d91fe307c5602c66d
font_01_sfnt_off00018523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18523 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D3A 10672 bytes
SHA-256: 486aeaf8c2562131fb361a87e3f8ae0b7c992e08dfd2fdcaf7e81a46b8360124