Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ffde7b6e1d9cea…

MALICIOUS

PDF

100.2 KB Created: 2021-08-01 18:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 652eb4906244f7f4062f89970f939ac8 SHA-1: d49dadc5061670e91ce0fbf1ceed3e94965d080c SHA-256: a9ffde7b6e1d9cea82380caf4c7846d1acd8d760782a0e86bffd56ab01e87139
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://jubileejec.com/userfiles/files/65204969760.pdf In PDF document text
    • https://bacninhonline.com/webroot/img/files/61968196543.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/lojutowibobilikurat.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef406042c---guvowunenegofopolutorukul.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/190431519781.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/1113888698.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210703170049_x8rr9h.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/kajetitag.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/9c4ca46da54e1e8a929f8ecfa1094559/pumasuwegagu.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b273d9594a1---jemadegubuxarifere.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e9827cbbc512316d5c2ac8dace232ca5/pikunozomigowofo.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/aa2585a28845ac3b0ecd0a5314ea6e5e/sunigulopufotimavedoju.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bc516869f---jilekefevagapigogivoronab.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/pubavorotasanaluse.pdfIn PDF document text
    • https://melz-feu.ru/upload/31008995545.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/pvvksvnvgefrfnbj724701c7da/43786647795.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/14318886499.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/e3421f5925a69771ff08172dcf0a03f0/pebibigujoba.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/goboxakij.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/dofap.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6fb232fe7---dovokubegemazilowulanule.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/xedujixuliwenadive.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/817096583.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/dudirama.pdfIn PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/dudapegolitixezewexariz.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/godonugelisaxabegovinol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=destiny+2+fastest+pvp+modePDF 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_off000120ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120ED 10812 bytes
SHA-256: 6b87712fc5bbb1badc0e9600eb200f4fed9c8c09ff718646194aa473836e3317
font_01_sfnt_off000139f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F7 19104 bytes
SHA-256: ad0a39c4b0f6adcaed11a31ba596b02d8d8018e0cfc2568ee2db428bbd618f81
font_02_sfnt_off00016a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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