Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9db9c7e68f628b1…

MALICIOUS

PDF

101.2 KB Created: 2021-06-27 03:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ba2981bcdbfac2ea9561405735cffbdb SHA-1: 27104eb289db097c57756e0a91240a1d8553aeaa SHA-256: b9db9c7e68f628b11ca30631b06d1e1b80821b2eece27ae22d2d4728a6a8fcc0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads or disposable hosting. This indicates the document is likely part of a link farm or phishing campaign, potentially using the JavaScript to facilitate the redirection or exploit vulnerabilities. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 https://cructi.ru/uplcv?utm_term=ohs+act+2017 PDF link annotation
    • https://equantumconsulting.com/files/files/55018542350.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/rabajepofisewob.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074994591c99---jinabotiredugelaxinade.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/jidosexuxoz.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/5b561efa64ec18a7cd6c37269321289d/suxawimi.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/46662075613.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/90619249400.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/bab381e54fe232533c8c8454a82ec5ee/11819677824.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/munovegafaxewap.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/39c875f0b68076418f9301e43b167389/lewisezetulavatepon.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/savuwuroruvumiwida.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609964ca1dbc6---35824416641.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/majapod.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/54646446493.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/vuvudaripebi.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/dudijakuzofekaj.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/15514465242.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/854d20be5e7761294b41119ecf81f419/mubazerusavinino.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/14889548469.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf169f243b---44946616559.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/tojumomulapebuluvok.pdfIn PDF document text
    • http://swingdesignhk.com/userfiles/4755149572.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f12dc8fc3---loliveratu.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/26211642463.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b547196586b---jujuzolinizipevolirarotix.pdfIn PDF document text
    • 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_off00012bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDC 17200 bytes
SHA-256: 269839368adc1f6c124b6c8919eda0c5d390e07caf4cba535ab1b92564d8b5ea
font_01_sfnt_off00015910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15910 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17127 10104 bytes
SHA-256: f2b03d288080a9584b6893a03387e2bbce08ccb693e3cd725a638037362614e5

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