Malicious PDF — malware analysis report

Static analysis result for SHA-256 e44aa6b28e47b2c2…

MALICIOUS

PDF

80.5 KB Created: 2021-10-19 07:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: f117533d8c15345b2abe8acc878ca903 SHA-1: 556924eab9efddb514c9ca42082a067fbab23478 SHA-256: e44aa6b28e47b2c28ea7090a4c7b8680e492e2d9b2b1ed51eb32b84c97f10842
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. While no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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://scalping.ir/data/files/file/4292215290.pdf In PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/26724571549.pdfIn PDF document text
    • http://inistor.com/ufiles/files/seweme.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161395c3132463---18547782331.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/08df27f4e5b1598455bc3f1f5c80137b/92948899110.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1632810201.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/sebebisubaxarakikudegas.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/luxubujelonowom.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/37081838812.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/88659766508.pdfIn PDF document text
    • http://keacg.com/upload/files/31887077859.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/xutipoforexa.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/44554763931.pdfIn PDF document text
    • https://pr-dienst.ch/file/16156701302.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/megurajatewatekafowetep.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/62173167412.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/7cebed8dc1f144c6a4ea9c3ff7c75c1f/norimot.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/504684645.pdfIn PDF document text
    • http://wdnederland.nl/file/tulawujoze.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/300db10f3a4bcd2f68ed62ece1959da1/fedeluvirosobixo.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/86774598442.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/48536109325.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/BcFPVxLj4jw/uplcv?utm_term=calculus+early+transcendentals+7th+edition+anton+bivens+davis+answersPDF 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_off0000d268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD268 18092 bytes
SHA-256: 6766db01c9d26a7ef35608436ddf5d91632eec1f4079f5cd4b3a425d5269e91c
font_01_sfnt_off000101f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F7 11052 bytes
SHA-256: 346cebf5f0f62c46fb0f6452956c8e5ba3cc71d87d77a54b24d0ca6bf7483794
font_02_sfnt_off00011bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1