Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8c2c870a5f99c1…

MALICIOUS

PDF

105.2 KB Created: 2021-07-14 01:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 164631a14bc6be5e10647ab53e007f83 SHA-1: 359a428e1c1df261eab4d94e9aea197259ab0065 SHA-256: 4a8c2c870a5f99c17ec32108677b83eafd74ae0b119027906e8e8ebe59926d74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The document body is unreadable, but the heuristic findings confirm the link farm nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607966fc892c8---35858505552.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d71a11992bff37e71e85746d626d04ec/14033080737.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/33006380571.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/60212497996.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/6c631d09cdddde543a33441e8db2500c/zifarijokedubuw.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/0kjhsvsvuc2b11t5u7nem28h10/12112054149.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160992429268a5---42229903634.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/46027995424.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/negadobidizizatife.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c2093cb71---89494850825.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/sotasoveveziribinotabep.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e21d70496---nipuzapu.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/16624114049.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/wegemivevogilaver.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb103a1dc1---nidadidomutojetufi.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873d660606c---kawigit.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/tq6u7hc51okkecnhtclp25ceqs/zegira.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/kavakedojabavisutub.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/takuxanejawoxikivawik.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/potivadasikuved.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed832008d7---sudog.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/riviwemoxaxare.pdfIn PDF document text
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/58262674719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+city+of+lubeckPDF 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_off0001333c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B53 10308 bytes
SHA-256: 5a9f06fe0e3d4dd000405a1c7b1835d7bd7b5fdca4bb1cfc1cd7ecd8aabd3a4c
font_02_sfnt_off000162b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162B3 20264 bytes
SHA-256: f17de7aa8c42bfeeefd3305d5215e4df8d69c722cfb02c021179e120f90f8246

Open this report in the interactive analyzer, or submit your own file for analysis.