Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ee2fd6d7c76a77…

MALICIOUS

PDF

78.0 KB Created: 2021-09-13 05:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c2b2dd0707e0c286a94f63461f210d0 SHA-1: 6369d14d8dc9227cd8c9b4b475589d333750881f SHA-256: a5ee2fd6d7c76a7783446d1dc7b0af85437cc17276566b1146e926cefa3ed1a7
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or manipulate search engine results. The presence of external URIs and a link farm indicates a potential for initial access via spearphishing attachment, leading to exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://canissapiens.com/images/uploads/file/kinitajifo.pdf In PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/86518388357.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/15093327204.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/32130792005.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357b02c9a11---59121325205.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/v2uu4rqgh5klfr7e69sb8vgqm4/1715489176.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/wuvox.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/36634905780.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/90222206460.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/c3118d21c3c4856a922362a0a790b6c2/pozegaxewi.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/nitego.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/6769516632.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/bosunukukepevuwiruzisefe.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/sexavujeki.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebd9051119---tulorasigil.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/28933476070.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/1510891155.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/wujebewapuze.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/4e7da71205aa002afbae0bbc8c1c7299/36094224609.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/68195874883.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad90b53c59---tifufiraduwaziwi.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/29227959198.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/natew.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/ponubuderopumedavuje.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/14608588839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=best+online+messengerPDF 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_off0000cd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE538 10340 bytes
SHA-256: f2c16b8c8e66e32a6458fd782508ea280ea42a052fb9d2e2d6cb77f061348c6e
font_02_sfnt_off0000fc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC84 17552 bytes
SHA-256: 432c6b0ec57429d5c7900f4848dd904f3dbeb2eeac8add62d0b8671b3a180ff4