Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f42234d87f8bfa…

MALICIOUS

PDF

79.9 KB Created: 2021-09-24 07:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ecb125a3ca49f0058b3113dfd30bd562 SHA-1: da707d3f6a94ee6ea9b5505268650a81b1ec6050 SHA-256: 91f42234d87f8bfaa9ec4677d49abbebd39150505d5e819794acf11320bae3fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains embedded JavaScript and a link farm pointing to multiple external URLs, 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 distribution. The embedded JavaScript is likely used to facilitate the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://regionalhealthprogramsww.com/images/file/kowopur.pdf In PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/71t94skcdc3r4agufl21de2piu/jitufuvabumejiferinejox.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/vazukarudalip.pdfIn PDF document text
    • http://atek-ent.com/upload/file/jigodewavipup.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/puzem.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614404f56d561---41103759422.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/25025438552.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/ronabaludepibiligo.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/19943579463.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fasopikakulanaxen.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613256bb28b9a---37040098186.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/43007645640.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/tifutodemizux.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/poziwavefirapifute.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a4259155e---mujivikijogoriru.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/42621468939.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/24602021756.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614c2e3ab6f5a---8136886866.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/dasipizatepebetixorod.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/fefunasudivexatome.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/49453568508.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/88831929349.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/79619286427.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/peladapavefepegaba.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/83686644058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=keywords+for+american+cultural+studies+2nd+edition+pdfPDF 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_off0000d217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD217 11192 bytes
SHA-256: b9a05dec6a6335d07c4f5b1bdc98da3f45093ea0ccf63ee2154bd9dae63292e0
font_01_sfnt_off0000ec6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6A 17384 bytes
SHA-256: 54fe493df0d457f8415b5eabc53f36627026f8a7b0c5f7e8bc0fd32d13724289
font_02_sfnt_off00011906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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