Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a20ee40ebcf346…

MALICIOUS

PDF

74.0 KB Created: 2021-09-04 00:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1eaad5c2fbc5ca151580b1347e0aa35 SHA-1: c211958e878ef6d6afab15068228855c7c400c1c SHA-256: 18a20ee40ebcf34671c3a9d03cfb31af4ed984b6617328c1eb1aea0b895d63dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. These links form a link farm designed to redirect users to malicious PDF files, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sunnysolutions.it/uploads/assets/file/detatemijinifo.pdf
    • http://ejmk.com/ej/upload/files/jidozebabexefu.pdf
    • https://universitecentrale.net/uploads/FCK_files/file/1813980334.pdf
    • https://traveletrust.com/basefile/traveletrustcom/files/23794687700.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a004ae55d96---guvetarezake.pdf
    • https://blogsma.com/files/244726523.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e72f8ebbb6---45885589970.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/085681a03609a86d37545b6692af2b14/nuvomixafanozovijibowik.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/iovlubcddra29m1d4rcripiqri/41822328437.pdf
    • http://hooleihomes.com/cms_images/file/22087132599.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/22802665bc6245776c87e358bed093a2/1619253683.pdf
    • http://biolabsrl.org/userfiles/files/vobejijotakefijenimolej.pdf
    • https://alamansyria.com/userfiles/file/fesezifamora.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/50e2b6747ce3e46546cebd3c575bf95d/xefajesadagalakokisosi.pdf
    • http://moreit.ch/productinfo/file/21126869203.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3498ea1428---62867617717.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940b3e3387c---98675434788.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a05d6e364---wizanepu.pdf
    • http://na3.it/misc/file/malopuvatirejis.pdf
    • http://dienlanhlongan.com/upload/files/93000823385.pdf
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/panoferegixomarisujadesul.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=bedford+reader+pdf+download
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/xaxavesi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd31.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD31 16792 bytes
font_01_sfnt_off0000d543.bin
160a4cf15ecbb33b615f7972d3069d3b652937c4903fe5af2200ac38a5f6d97e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD543 17816 bytes
font_02_sfnt_off000103d4.bin
6f96405d1ef857d5b5f3301f939cee95041410b1a9c7e81fda4b74a13ee7988d
pdf-font-stream PDF embedded font (sfnt) at offset 0x103D4 10272 bytes