Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4febad0e6e2d25…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 02:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 10adf736cc56623dc09439dd35a53f76 SHA-1: 59508a9030f1e6ba574e40348ec823b87cf8d4a4 SHA-256: ce4febad0e6e2d256d9d3185262e96e2683990d16c092d3902a3cad40c2340ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous URLs pointing to compromised websites, suggesting it functions as a link farm or redirector. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious, reinforcing the assessment of its harmful intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://catamma.ru/uplcv?utm_term=nanice+ellis+pdf PDF link annotation
    • https://aplusadvance.com/naver_editor/data/file/wapaxe.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a40d555519f4286df56b19f2c9b91750/luwelunafomivogo.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/077d3fef65b78f940359d6b1b22ae747/85087128635.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/sobizivone.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/268775931.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/laxidugiluzol.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/sepaxabulunogala.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/84712055952.pdfIn PDF document text
    • http://techbis.pl/files/file/31147110025.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/8ec0377a2a84915025ade0542b7b2f32/rapikaketosagiv.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/kasijowakapuzo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b154c2cee---90106324904.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/rejilito.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/xurafajobolapovafomutenuv.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/34976654492.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc36d764d80---vevoku.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/62798cc10e3e44388e0456b063c9aa86/13123109860.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/30940411779.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/9tqcb393ic245nl16a66oegrvg/52474250002.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/nimetasuxalewog.pdfIn PDF document text
    • http://ilkemymm.com/image/files/vasuxijitomede.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/losulalulevepojiti.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/miwinir.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/0ldgl41400dam9irqblag1gm29/79057034248.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/futotozetapo.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/5c3e317fd99fca97a201b4c71dd88b75/11182731122.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_off0000d7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF013 10272 bytes
SHA-256: 1b6f438ed52572a40e8717aacc61d2e85da547d1a19bf3b7a4727c436cb70396
font_02_sfnt_off0001073e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073E 16828 bytes
SHA-256: d293afb955bfd28471949b2e85b46ea74d25dec2aacfef39b8afc3c8ed8eb085