Malicious PDF — malware analysis report

Static analysis result for SHA-256 651e81a635337eca…

MALICIOUS

PDF

81.9 KB Created: 2021-09-12 06:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 491f5d90d0350574ad8f35a53a246ef9 SHA-1: 658ce76c905d5bb7fd69438b25c3c75fe48208ab SHA-256: 651e81a635337ecad2b8c3c46873bcf09aeec0de23967b0fe7b0cef9a7072f00
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous external URLs, many pointing to PDF files hosted on potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic of using many distinct, low-reputation hosts to obscure the true malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://frankifoto.com/uploads/pages/files/votetilizefosurojetojalun.pdf In PDF document text
    • http://tortsurprise.ru/upload/redactor/files/loxujowiguzedoregobezexo.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/67890188074.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/68094784150.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/19185476675.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/2n37cvatc3203sse3udtn1ep12/37846733842.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/16767972266.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/komibatunepeginigexi.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161317f25230d7---21395592789.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109120600569599.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/16294929185.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/2711549404.pdfIn PDF document text
    • http://fnathservices.com/upload/file/rizugodowo.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/7742065278.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/kgv1dn8qrjst5f4e77i4s4ai32/48512754632.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/lagaluzajofujosi.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f78398d104---tojares.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/riluxuvusoxogadesaji.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/41906537502.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/35664924181.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/19139353533.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/magisefonubodumigezumukum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=zombie+survival+wasteland+apkPDF 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_off0000cf31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF31 11000 bytes
SHA-256: 1ac3699853134c659d5a9fa813376820c0a87ca85bea3192404f87b70b01eca3
font_01_sfnt_off0000e893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE893 21856 bytes
SHA-256: 492bd600500807b7d2c34278a57ef19e4d3962f54c43aa4f63c51aff7a2c75bb
font_02_sfnt_off00012252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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