Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed792a343db02e47…

MALICIOUS

PDF

77.5 KB Created: 2021-09-23 22:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e6b79fde7ee6a6bbafe50f2338ff815b SHA-1: f032d84f3fa4154a884bc2a446f03cd014b757ae SHA-256: ed792a343db02e47ffff3cdac1afe9b3acbbc81a84fdfff9965f51796f276931
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI links and link farm heuristics indicates an attempt to lead the user to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://nomylo.ru/uplcv?utm_term=colors+tamil+tv+new+serial PDF link annotation
    • http://nawarashop.com/phya/ckfinder/userfiles/files/vatiluvoz.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/kezitelizatixapekixuril.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/lq1bac5hsfdkkni1u5n6ug76ms/84365627895.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/wenebum.pdfIn PDF document text
    • http://fitviewer.info/files/file/39236693400.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090706495751.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/67565381863.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/16949655020.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/xovenawexaguziva.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/vegez.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/firefuzapajodadatisuv.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/jokemamebopojor.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613126ba3a847---49524615154.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/25429651181.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/20s3kjldt34d4duii1praudgq2/62097084315.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/xubixus.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/nubazitogaxobojefer.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/gotiwololamakosago.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/muwatarodubanuwowazeteg.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/9753658786.pdfIn PDF document text
    • http://robbes.nl/media/files/21488642419.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa421a7a3---68289658632.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/44347144955.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/75085002424.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/xutisiwagabakowekowigapi.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/50641266945.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_off0000cda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B8 10452 bytes
SHA-256: cc87e371ae6baf7247eb2b18ef9da1620f463002b9e6c2c2aac7192f0324d970
font_02_sfnt_off0000fd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD81 16724 bytes
SHA-256: 7c05d57e3ffddc6656ea5bd97f72ea52914b0d3d71039b49699d75b13d4ad5d7

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