Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5a0814a3558a7d…

MALICIOUS

PDF

72.5 KB Created: 2021-09-10 15:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 25e2ba68a4567525ed25668fb526f788 SHA-1: 1a946e09efd08c2ab05c235cc357e02cb6007b30 SHA-256: 6b5a0814a3558a7d0e9b51e5b493f0ff433b88f14b3d11963268739ba0ec325d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=cyanogen+ps+vita PDF link annotation
    • http://betheaskssd.com/flash/betheaskssd.com/file/lixigexedagazuvalo.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/43846468379.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/gefogopaxa.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/70875688884.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/fegodekerijagasikubope.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/gri5374a7ac5ofhp88f84ntop2/3535708922.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/migikuvoropuriboduvizera.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/81344055375.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///45705984797.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613a68ff06e95---petadofegegizabegipi.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/wezelip.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/9331429615.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/66574101829.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/xilejabefupag.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210907123831_589512.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/zawogirugovifukapig.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/54541335385.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/fidifumesowido.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/20684697620.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/97454715515.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613579ecf3686---fadesuvetite.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/28871142115.pdfIn PDF document text
    • http://ed-union05.ru/files/file/setijojifer.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/76255428865.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_off0000b36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36F 19172 bytes
SHA-256: 2525940029c9dab90bfed10c175f1c231ba660f082fe829753268e2665d657c0
font_01_sfnt_off0000e472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE472 10492 bytes
SHA-256: 504b09995ed21aa1a106f924e1222a0d1e4158f8371bef3b7130cd20355cdee1
font_02_sfnt_off0000fc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1