Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f62c7a1f86480a…

MALICIOUS

PDF

69.1 KB Created: 2021-10-04 00:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2c08f3d0a9249e9fca7581fac4246d1a SHA-1: a754ed611853de8edf5cbdc028effe7eaeb32959 SHA-256: a6f62c7a1f86480ab1de2b93f14b4831496ddbdaaa790b78a14338630ce4bbf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://irlanc.ru/uplcv?utm_term=red+dawn+2017 PDF link annotation
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fd4848597b---vodovexelomojusijimusos.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/fidegiwiliwonovik.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/puguxugamazorijirazaf.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/jajevulemof.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/fuwodenegog.pdfIn PDF document text
    • http://horvathortho.hu/tmp/vufonakuxubazizivovad.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/wavukafujiguvegumeliputok.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/tevafasixonikoz.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145461dc543a---39868816580.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/47183132791.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/zigafaviz.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/runifavixisedosegi.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/78133648730.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/vejefifeludixekolobaxiruf.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/2b8f96b623b518eeda7d5d72ea5ff527/devuwipunuxikavoxe.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/1cf505ab62e333a85d90b8211506f075/32097670422.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/2kiaov5ef90er9u5vql5n5nd5u/90787157095.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/navetoko.pdfIn PDF document text
    • http://glassick.com/userfiles/file/manaxunekex.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/b9uu3jsacr0qchaoju91fnr82b/35711870419.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344caf63112---72110067934.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/tobarewasemadokodo.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_off0000af12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC729 10092 bytes
SHA-256: 932b9a448ee9b16786159d073addd2a153fa903878d0f313202f587286258618
font_02_sfnt_off0000ddf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF3 16060 bytes
SHA-256: ffa03142180338c0ee753030a7fd94959c5df7acef229cf790dd8d37836ff96d

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