Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca907744c6778448…

MALICIOUS

PDF

81.8 KB Created: 2021-09-28 04:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bdae2fb6219c80b595a4e97d2f9150b9 SHA-1: 077b33c732ec79446f86842d3752441863ecd5ec SHA-256: ca907744c67784486dd2f4a9ed85a04de681008ba3340327d0b829d6e12ebafd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised or disposable, suggesting an attempt to redirect users to phishing sites or malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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 http://cungcapbaoduongcuanhatban.com/upload/files/86774070194.pdf In PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/xelivogisene.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1614f28d26dec9---niluvovideka.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ecc10527bf---56719110357.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/99389778358.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/41847418955.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/1484f0a217a7d04ffa20a524bfa736fb.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/54213722411.pdfIn PDF document text
    • http://viorina-deko.com/images/file/dopogipuwafajupipu.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/48013343795.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/27531698048.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/jixexibejofe.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/jojafukimakojaz.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/xegaxafedokef.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/87889860732.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/83921235690.pdfIn PDF document text
    • http://nantong.chinatupai.com/web/js/ckfinder/userfiles/files/24085991967.pdfIn PDF document text
    • http://sayarbobinaj.com/file/gapar.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393f53c9e6d---lemazepofisipu.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/46812407551.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210911_C8CFCD8E7FB1C3E2.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/fevaxirutodejobekekinowid.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/25577144113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=jak+pod%C5%82%C4%85czy%C4%87+pada+xbox+360+do+androidaPDF 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_off0000d803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD803 17872 bytes
SHA-256: 57364d2f87dcc5322449435aeac4eeadd27b9e18f336d326e643ce2d6da973cb
font_01_sfnt_off000104c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD9 11468 bytes
SHA-256: 491e947098dd7358a68e6aa3c91e0b1496dcce0c8abeddbe50f734bbf0568b98

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