Malicious PDF — malware analysis report

Static analysis result for SHA-256 241a5796d6d7e1d5…

MALICIOUS

PDF

68.1 KB Created: 2021-10-03 05:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7d288d6a017e3f4823a2d94fc89f413a SHA-1: 7f03a8c66876ad57abe9285b418b7b27f04357de SHA-256: 241a5796d6d7e1d57d382988be72ae891ee997df5386e07e37f54e98ab391261
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a second-stage payload via the embedded JavaScript and external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://inwebjor.ru/uplcv?utm_term=the+global+winds PDF link annotation
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/zewokulolu.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/sufosozepo.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/mewokibodesugevejakewa.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/74690709123.pdfIn PDF document text
    • http://teplospectr.ru/images/files/77470914430.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/bosumiw.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/dijaluwanu.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/45361826187.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/57887229929.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/90146200007.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/46850489601.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159032c3c386---buvopupitamodujujofuziwok.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/86315977262.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/3885ea022bbe5a68caf16d0bd6df5416/rafurimiroduke.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144854d28151---14314942512.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/sapunexexobopogijamanak.pdfIn PDF document text
    • http://irollee.com/userfiles/file/46349946565.pdfIn PDF document text
    • http://goref.ru/files/file/rikosimalibevef.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/wotezotegefegelitekiguli.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210930225310442.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/kisekuvugomagula.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/didofewezagetowupezoz.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_off0000aebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D1 14520 bytes
SHA-256: 440e795707405dd4b92c23ee049ec37cdebc9d0a541d15726f4378182d6f3d02
font_02_sfnt_off0000eb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB54 10516 bytes
SHA-256: 2fce4f665eaa616620e965619951c1880be199699ac39c406dae57bc6011b4e3