Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c300d490439df9…

MALICIOUS

PDF

72.1 KB Created: 2021-09-22 12:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: afaee63edb8de639bcc1497466310f03 SHA-1: 66c60cd775695cabbb4ac0daf5ca016cd5cc01e2 SHA-256: 16c300d490439df9e05dc96908691cebd45003e26030be30820573879969dc56
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to lure users to potentially malicious sites. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/fhbnkucbjpb1u3kg168bce7g77/88931459885.pdf In PDF document text
    • http://sfipl.in/userfiles/file/sozizepoduzawa.pdfIn PDF document text
    • https://andana.us/files/files/jizafamalapivames.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/fibonowubelujuwirogapebo.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/52044785319.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/81644468453.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/57056659275.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/38844293715.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/1933375711.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/peniretigumokebazifazugi.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e931ef19f4---mebixutinepukirivizonijox.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/vexapufajuw.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/bibazekotuwufibemopu.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/repogobevagoju.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/sidivozijopavodorumax.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/sadafilejotoladora.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/ginoromokuwakelaronegad.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/47776137148.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/25141182597.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/xozunuz.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/43509921063.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403b21957ff---juseladurovolakoxesonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=drivers+knowledge+handbookPDF 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_off0000b8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DD 10816 bytes
SHA-256: 3d1cf2f6d472bcc41a1c40ec9a122c4e8f782a35d428915bb922df9421fd45e9
font_01_sfnt_off0000d187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD187 16112 bytes
SHA-256: f97abd3449291330093d2b9f6189e6a26737924d18dd9e5ec3f3a8ad66cc1f0b
font_02_sfnt_off0000fa96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1