Malicious PDF — malware analysis report

Static analysis result for SHA-256 df78ea641bc0bee1…

MALICIOUS

PDF

71.3 KB Created: 2021-09-01 11:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7a51e70bb5ea7646efe73240026ebb96 SHA-1: 508f5edfa61899071dbc496d83c63d8d133e70ea SHA-256: df78ea641bc0bee1df94c0a39288c5bb165bd19c5fbce486538b08e97e3f5bcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to phishing sites or download further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1f868acb9---18030485634.pdf In PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/runoze.pdfIn PDF document text
    • http://pjcwyy.com/upload/file/55679218119.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/38402520758.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/kovas.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088952d4c1fc---85142767231.pdfIn PDF document text
    • https://luminex.pl/upload/file/ruwokeviruwewazugavan.pdfIn PDF document text
    • https://viticoltura-enologia.com/file/68608596263.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/lelob.pdfIn PDF document text
    • http://3sdent.com/upload/files/76868356199.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/1584642028.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/rusifo.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbd98cc29cc0ae66148e8d559c71e5a8/zajororarem.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/15677380030.pdfIn PDF document text
    • http://zimmerei-possert.at/puxawumawizulidonigajixiz.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/73516072549.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a78e7b337e---51864689131.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b59d8720c1---tawinudapexigulir.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/72643335577.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0b8b13923---14767313047.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d8444741d---29277870173.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/d2707f3aa776c59918dfd529eea79b1d/1617679291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=minecraft+how+to+cook+meatPDF 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_off0000b776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB776 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8D 10560 bytes
SHA-256: 336f2236f7a8bd2bb8fcba5e98fe706cf1a92ca129c826ce88a8ce158d7a6023
font_02_sfnt_off0000e783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE783 16188 bytes
SHA-256: a2866cee121a62bb81b58e4f6282370e0352bd1299c144ac767b94ce1d3bf4ff

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