Malicious PDF — malware analysis report

Static analysis result for SHA-256 2de7b30ad763fea4…

MALICIOUS

PDF

91.7 KB Created: 2021-09-13 19:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 20891a29ba994bc0678824d4e6db91a9 SHA-1: 35daad2a41a72204172e98491306277e4716d742 SHA-256: 2de7b30ad763fea49dac0dadf0cf83e1ce42f51e14c18dfc42c68b2f360d5556
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms or disposable hosting. The primary goal appears to be redirecting users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce1ed2f72b---7081669020.pdf In PDF document text
    • http://castel.lu/userfiles/files/71789800175.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/jiwakejaf.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/e885353649cc93d7fae2760078305e81/38373315737.pdfIn PDF document text
    • http://robbes.nl/media/files/konuzuponaxiwironemudak.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/49668277966.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/21857692704.pdfIn PDF document text
    • http://elskenecologie.nl/files/26461591524.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/51347875079.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/solek.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/04/62410627065.pdfIn PDF document text
    • http://drtamerturan.com/file/dufilajoko.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/puwutemikaxolo.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/23e9cc6b11e5b95c3f8a3f2cace588b2/47327551138.pdfIn PDF document text
    • https://bachson.net/upload/file/22155230641.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/taxogajanu.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/12264188794.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/fufapizedigovorumesib.pdfIn PDF document text
    • http://glttek.com/userfiles/file/gosafupixelak.pdfIn PDF document text
    • http://amkchem.com/upload/files/13152873305.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/wopimixovuzat.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/69618060819.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/zunexogukozorirakum.pdfIn PDF document text
    • http://simonide.org/userfiles/file/32205167580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pcb+design+androidPDF 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_off0000fbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BE 21100 bytes
SHA-256: bd7d28b31eb97c552d356125458442c10c81b3ee0e59899f7cf867ec8df9f80c
font_02_sfnt_off000149c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C3 10544 bytes
SHA-256: 2b24bb93e90087e1e6a862e1c8c0a14e0a2242dbfd83431d6c81f08afae28595