Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03ac75084be16c5…

MALICIOUS

PDF

86.7 KB Created: 2021-08-03 05:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 45d70abbcff13b5d4e452a7c361c2b9b SHA-1: b02f3ba5ba00404fa1a44af50d8780df9189aaed SHA-256: a03ac75084be16c5c65c5d562dba7d846b984ee57e751a955158ad6d57662813
196 Risk Score

Malware Insights

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

The sample is a PDF document that employs a social engineering lure, instructing the user to install a browser extension or update. This is a common tactic to trick users into executing malicious code or providing credentials. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan. Several embedded URLs point to compromised CMS upload directories, suggesting a distribution mechanism for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/0a2dae3317ad76efc9b016b5ff147020/15423491121.pdf In PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610635b1eabc1---98539104038.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/41642813744.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/9897468989.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/18391744378.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c47d7d520e9---sufabeginu.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d13d1236---dufavazububisoboduzijur.pdfIn PDF document text
    • http://nature-revive.org/files/file/12633423269.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/25724899729.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/38aa6b89fa5c15368bb6f8d52caf9d20/nitetiwesimigofodibimav.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d2d23fc88---91711928038.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/35260121991.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd7469b71a---36295966881.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/92684804756.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3c16c2f93---venavitozukoto.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/kitimipisamujanes.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/qfs057nmefgvkj8s9nm464br7d/falowatorilupowevudo.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///98018383608.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/836c46192de79d261038e251725dbe61/54685563077.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202152852723.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/xoditav.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/74408605192.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/11092435210.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/poxevabuwuwirasitapesuru.pdfIn PDF document text
    • http://nessium.net/userfiles/file/25318171609.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=end+of+bandit+queen+movie+free+download+300mbPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7A 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
font_01_sfnt_off0000e691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA3 18960 bytes
SHA-256: ceca639cf52ac82226e3c1bab7a2f648a06ed8d87104e3e286f48865c32028a3
font_03_sfnt_off00012f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6C 11160 bytes
SHA-256: 9905c8e1985cee3478229f640577e80a5c65e1cb3c07da7f34ac6067121115d1

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