Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d9a228dc469325…

MALICIOUS

PDF

68.3 KB Created: 2021-09-26 11:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01b4a54e4fa650f318dd875870bd13e9 SHA-1: a0a6687591813b2eaeeba3d8200ee35fc7ac840b SHA-256: 41d9a228dc469325c8a774efb18f51d3b806ff598c4a4c24c64b16ca43fc273b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and a significant number of external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/4f718059fc52b0037d4f5981e600c5f9/72263650220.pdf In PDF document text
    • http://gold-carsales.com/js/upload/files/29434272068.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/pived.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210920142244751338byoav1.pdfIn PDF document text
    • https://diphong.com/uploads/domarusakinipidawakereni.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/pofovoketokofof.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/56336803605.pdfIn PDF document text
    • http://banquat.com/userfiles/files/gixetumozokidamiwudetetox.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/5559856733.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/xuwexerirotetetudovurix.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/gumaposum.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/67618788415.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/zurufasin.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/49127311542.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614eaf277375c---90316428621.pdfIn PDF document text
    • https://communitytreasures-co.ravebusiness.com/gbe/useruploads/blogs/files/68368187885.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d33462eda6---ruwavofifitefox.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/rodikej.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/subikukelom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=install+chrome+on+surface+rtPDF 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_off0000ab4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC362 10560 bytes
SHA-256: 6bd49058047be624817448fd576ae046286346d66d388cd4c94dc6c7cdaa2cb5
font_02_sfnt_off0000db4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4D 16376 bytes
SHA-256: 817a788e4a579dd78107830b347787e7d2ca458026a8ec122e5cbbeff07a9dc6