Malicious PDF — malware analysis report

Static analysis result for SHA-256 48d1fc53875318f0…

MALICIOUS

PDF

73.7 KB Created: 2021-09-21 08:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 655cdca4e13f3f264d26a590f0eb35ae SHA-1: f56870181d20b0aa52f01c8c73ea66dfaf8cb402 SHA-256: 48d1fc53875318f077bcc82680025e5289a126db553f9e198a61e4ea81eacf57
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting. These links are presented in a way that mimics search results, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=bhagavad+gita+chapter+1+slokas+in+english+pdf PDF link annotation
    • http://geometrabottero.it/userfiles/files/babizufig.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/ee586f799ba8f4cd4349963dd2702d66/1525142141.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/wefovativovepe.pdfIn PDF document text
    • https://guijek.com/userfiles/file/tubudonexituzugetukitufaf.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/juxafaguroguwip.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/ligoxexejixepalizabevo.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141a766f1b06---11610603022.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/jiwagaxigikona.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/mosikedekuna.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/moxubitopotodumadibemepa.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/sulivijozetanonenus.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/66845731419.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/63799228907.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/76062291518.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/35868485752.pdfIn PDF document text
    • http://getem.pl/files/file/dadabubonunofezidefupuf.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16137dd811b846---foborifonesudetedoxed.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/31703409648.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/xutewaxusoweb.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/88608712713.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/81900357223.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/rujuzekimovexoneperax.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/46796639543.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/10251750464.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_off0000bb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5E 11160 bytes
SHA-256: 7a144965f824883c332a114fc610f05994686299a091a8ddfa4d2948ec4302d4
font_01_sfnt_off0000d54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54B 16804 bytes
SHA-256: 31c2c9aaeae7919debff0f10e9c7c8f11a0c662f540d6aac008250d81aad5c25
font_02_sfnt_off000100b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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