Malicious PDF — malware analysis report

Static analysis result for SHA-256 342dfbfbc2ee5331…

MALICIOUS

PDF

70.7 KB Created: 2021-09-27 23:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 7fb3361650a0632021822adac2cb0256 SHA-1: e005c80764de48bcec074ebd91441241c608acb1 SHA-256: 342dfbfbc2ee53314b11d47ea9d3308ccbae7d70bb188a11cdda46236dc4239f
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. Heuristics indicate it functions as a link farm, pointing to compromised WordPress upload storage and other disposable hosting sites. This suggests an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://arerp.kr/data/file///xeturusubig.pdf In PDF document text
    • https://hinaweb.com/upload/file/fovipakunuv.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/nuzuvesowuforibalekegoto.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/78637019041.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/wizobosifidepo.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7359e6030---51986623494.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/renozamabe.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/supopilakale.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/tuguboraweba.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/wesijive.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/fowokuso.pdfIn PDF document text
    • http://shopabrang.com/images/files/9069087526.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/10469109091.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/totunoxopukatoziwato.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/gedotatumaxiwifawusu.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146915c30614---fakixabekewilo.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/39634606717.pdfIn PDF document text
    • http://poiskvod.ru/images/file/40154189113.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/29165693147.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/49757408612.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150e4d57faaa---murikomikuwuxopunosoj.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/2203548821.pdfIn PDF document text
    • http://orderkai.com/uploads/files/68628072627.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/96574203634.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614f3b006a2ca---poxamusixubal.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/47010580080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=us+government+representativesPDF 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_off0000b543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD55 15524 bytes
SHA-256: 8524a9fbd56d91a9ab2f8ea8fdaa717b16f473ecfb2371c1c837e58c495d72ab
font_02_sfnt_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 10620 bytes
SHA-256: c73c437dae9545ed4b1b7604640ea00f7c94700273d0865393223c6b602f5ea6

Open this report in the interactive analyzer, or submit your own file for analysis.