Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db0a56f498b3a09…

MALICIOUS

PDF

77.6 KB Created: 2021-09-17 18:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: da3be8ad72cd1ddfb0d4c022ff6b5493 SHA-1: 2660ac6ae50b422a4b7ae1ed7adbcc3ff5b67a8b SHA-256: 6db0a56f498b3a0955414e66bea81e55ceb118567f84f562a9e02df93dfc844c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://gulfb2b.com/userfiles/file/47221928071.pdf In PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/96171300685.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1f608076c---89415135050.pdfIn PDF document text
    • http://jar-ted.pl/file/pebugejatexagekoretawe.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/60596712142.pdfIn PDF document text
    • https://arerp.kr/data/file///96147486537.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210913_010808.pdfIn PDF document text
    • http://imi.vc/upload/files/junin.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/38987596604.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/45521277234.pdfIn PDF document text
    • https://superchills.com/userfiles/file/45336369706.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f43a8eafbc---51780022078.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/pisoninafuwoxaluxilimado.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/45384966949.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/77255855527.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/vexazogufe.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///95536382386.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614313cf1bb16---buwisuw.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/50556091769.pdfIn PDF document text
    • https://inks.bg/userfiles/file/monexojilage.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/gekukanurofamesiz.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1631738949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=contemporary+project+management+pdf+freePDF 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_off0000ca6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE285 10932 bytes
SHA-256: c2171bfd742a725ab3ccc52fb2d65e75a13634e79b003c885ad40b038b8d838e
font_02_sfnt_off0000fbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAD 17460 bytes
SHA-256: ffad480878de236ffdcf2be5573634f0eb2a4e80e94191d5bb8680137c508d79