Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ccf307d801e303…

MALICIOUS

PDF

80.2 KB Created: 2021-06-27 22:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: daa0afc672261d2cbd701d71e97c95c0 SHA-1: d51f4becfeadfcab619e986dab8b0d47c03a8fe6 SHA-256: 44ccf307d801e3031eac876db99e604d148f733a1607f83a8df241839be717ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous links to potentially compromised CMS upload directories. The PDF structure suggests it functions as a link farm, likely to redirect users to malicious content or phishing pages. The presence of a 'download' button lure further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d5c659ea8---868065420.pdf In PDF document text
    • http://starsunited.at/upload/files/1377821197.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/rujomarabesejesulirut.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/f6226109ade1b1a24e802ac15ccdcf22/37603552068.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608059a7e70c9---74957996885.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/25293e170d7cef2d52a909915b69ef6c/suvoritonitifumewogik.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/75d179dced9337be15ac40e4d1615858/kebamob.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/kejuzaxixujugorimejone.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/jd83evo36hcrh8qb1ftf4huid9/bawuzubekoxel.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/30313976943.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/6062417b480ba523f7f990a704ec3f57/dolivivonosewobag.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/59480873440.pdfIn PDF document text
    • http://intergeored.com/upload/File/vukiw.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/xeban.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070ff19721c7---10631149716.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b6ecae778---67920220229.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/65108561181.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/6c7b62e7ec9d1a9f0ea7841a4500dd65/28667738855.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/7ac2d5c3d59f831723d32d37575ff48b/39166007175.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/399828050.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160753189845f9---99106295609.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b6e07cea134ebdda634257fce241d47d/70354707786.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/fesifupen.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aac5bdcb1ff---92210217078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=uncle+johns+band+tabsPDF 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_off0000d478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD478 10552 bytes
SHA-256: f3ecc4805e01ad53bb7c5044f067754a7661096617c32801f4edc5e30a0811c9
font_01_sfnt_off0000ec84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10496 17360 bytes
SHA-256: 662bebcf141eb4f190c8a30d24498cd81c583ef40350bb6f43c3336b7f7ffa73