Malicious PDF — malware analysis report

Static analysis result for SHA-256 749b7cd8abf194e9…

MALICIOUS

PDF

75.7 KB Created: 2021-09-20 06:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 015eb2a23082f9fd6728160304843288 SHA-1: 4a6e4d3d3e50790b3525c5dedd9f095d7cb3d927 SHA-256: 749b7cd8abf194e949dfb6f051635833ef401bed77695d16ee77c63bc23a4882
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of ClamAV detection and ML classification as malicious further supports its malicious nature. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not meant for direct user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://ecoquimica.cl/dinamicos/uploads/file/64785210481.pdf In PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/kaberapitelofor.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140d48fb5ee4---sikisimurivofafigazalidu.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/41612664140.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/depubasataxubuxix.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/zejejonaverurozopamevomar.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613867dc71f89---jumojekegifunakejet.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/445c5d92513d13fffe0a1102db15aa46/fabigomabutadipozo.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/92099791207.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f1c552b292e4d49346f97a186d7b21fe/89936185244.pdfIn PDF document text
    • http://lawngo.net/fckfiles/93399520840.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/89886624608.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/nobenosegudi.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/taxujalosenewalom.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/8a128f6c0bb3ce69dd1f32e215f62ec1/rubudawoxisuxe.pdfIn PDF document text
    • http://boxethai38.com/upload/file/tagipalekegifu.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/sazosoxa.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/kuxujonirupilamateri.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/54998770981.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/1354241461.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147f22dc3a0f---posawolag.pdfIn PDF document text
    • http://hnht-electromagnet.com/d/files/84775974649.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/1410884064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=avengers+infinity+war+full+movie+free+download+filmyzillaPDF 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_off0000c190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC190 11104 bytes
SHA-256: 5544324890a055a864faf19aa16eaec539b7669c7dd82fb7fcc98d0991e2e565
font_01_sfnt_off0000db61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB61 17508 bytes
SHA-256: 080da5c271c7a76a3a50725530312bf409c03a0a0285e1f60ad518fd66246ae3
font_02_sfnt_off000108af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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