Malicious PDF — malware analysis report

Static analysis result for SHA-256 82bb3d089dd578f9…

MALICIOUS

PDF

73.3 KB Created: 2021-09-15 16:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bb5ff337dd381b5b99afaa9c9f10c7c2 SHA-1: d39bbaa60197ef49806feae9effb0ac33d5a385c SHA-256: 82bb3d089dd578f9b7bf217cb91a663d4b360cb773151e17283e3504aa53235a
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many of which point to compromised websites or link farms, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://archism.ru/uplcv?utm_term=mallu+kambikathakal+pdf PDF link annotation
    • https://auditorescr.com/ckfinder/userfiles/files/17845246353.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/vemuzoniniwumaragulezomi.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/11897160774.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/satotuwozifozomirisonupup.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/wotizimupujud.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/43l433a6k385lg9s0r1tijvcmt/beleninikobexopuze.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/bubiforibul.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/19321617247.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/60491114645.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/22196886752.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/58031522396.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/99103888199.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/62885416498.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613426888e01d---35511733246.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/vapamadivetixakadovoj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376866afe86---kuminofunuvozesobewefo.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/6284976816141d80652c9d.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/nixifulupeputeve.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/88437330871.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613743395032b---kapitolapegupolebum.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/bowasivukonisixukam.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/lododibiladuvupa.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/8748687089.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/22149596519.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/buzexoz.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_off0000be3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD651 16172 bytes
SHA-256: 908413bdbaa528d097a326b4fb0bafc8599f65927e50fd3499edb63493d3062c
font_02_sfnt_off0000fff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 10464 bytes
SHA-256: ed4a27c7ba00d7c6ade4d1b460630a0f1a19f8bd5c866ae312febc09d45ce970

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