Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e38792706365df…

MALICIOUS

PDF

80.1 KB Created: 2021-09-21 09:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 091a29777a39dc34208180c1c7d26680 SHA-1: e79d8048fb81cc595a5c78e7f6a6cb0fbadb1371 SHA-256: a1e38792706365df6c3c2f4eb85710decdbb6ced13018bd7c5440ba72b2e2b9e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://irlanc.ru/uplcv?utm_term=pokemon+black+online+emulator PDF link annotation
    • http://robedecreateur.com/img/files/kixonowejip.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16130d003afc33---welogukulotuvesujasa.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ttk3c47rck9abntje792k7uqkf/fiwavuxira.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/46187176266.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/savudutuwogidejosukux.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/tivavifetekopuxuzikepad.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397f71b1aff---47500437777.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/kuseforavexoberapujaxeli.pdfIn PDF document text
    • https://afma.pt/site/upload/file/nakexiwusidajukejewur.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/jibebi.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///zejojazifitow.pdfIn PDF document text
    • http://feg.vn/uploads/files/20844835648.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/78248737913.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/fogodopo.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/roxisepowabodesaxuvota.pdfIn PDF document text
    • https://webrobogo.hu/kepek/20829290237.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/gonodokedu.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/xusamologa.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/romulasafavaguv.pdfIn PDF document text
    • http://gibisch.com/files/files/xolaj.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/57536918053.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/woxusitotiketatenemoja.pdfIn PDF document text
    • https://oalysa.cz/ckfinder/userfiles/files/58027719950.pdfIn PDF document text
    • 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_off0000d041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD041 10556 bytes
SHA-256: 596e61cd7ec660986db307731172e7fcf9e5a37bd5b51b76dc288b166aa858ad
font_01_sfnt_off0000e84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001005f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 19460 bytes
SHA-256: 99dcae48c92d96da0caac400498837887910815af07405dd2aa7c13ab50c864e