Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b8f6aa9f8d97bd…

MALICIOUS

PDF

79.9 KB Created: 2021-09-10 11:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0307453b1903732161d512f3313ab477 SHA-1: 4573de2ee2e4af9fbdb1795612ea38a71b89c6aa SHA-256: b4b8f6aa9f8d97bdc3e4b17b73fb0a61ab4d4b70ea9b2bd633a9ec5dea9e4224
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://ketchas.ru/uplcv?utm_term=www+online+movies+com+apk PDF link annotation
    • http://sushi-belovo.ru/files/lovelifaw.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/19513048359.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/pagexilesepikom.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/60039136605.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210908061138.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/babonegalogupar.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386e61e4a5f---2155865566.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/vonozosapuvikinanatuzix.pdfIn PDF document text
    • https://123natura.com/stockages/files/37729972629.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb9d59c2cc---bibutulegerez.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210904113009.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/newapagitir.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210905231825.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/36638678537.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332d5aec0e4---dikovexulibusofer.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/530827620613aa314b43cb.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/biwatodiv.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/bodereje.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139132b9b368---bipix.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/a2ksvt3t1mtuuk0bc183fqdhg7/fipuzozodogip.pdfIn PDF document text
    • http://dominant.name/userfiles/file/83058243744.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/mugisipawelavumebuzivid.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161350fb0df566---dorinajotegaluwobopavape.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/riwipenexuko.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62E 17188 bytes
SHA-256: fcc00ed1d15fb874bf24eb9256cb76c3838144fbd1cc02f831105c5896a34ca7
font_01_sfnt_off0001021a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021A 10576 bytes
SHA-256: 841c5df62304ae2c2a961f3f57c7d90a10df0f38ba7943fc5a33266a6151d66f
font_02_sfnt_off00011a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1