Malicious PDF — malware analysis report

Static analysis result for SHA-256 84fe121be3d0ed20…

MALICIOUS

PDF

73.9 KB Created: 2021-09-18 22:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 550f86783cbfc3f3eb49c441f23e10ac SHA-1: acaf9d8547bff39127fbe1f268083fbb57cd98bc SHA-256: 84fe121be3d0ed201a631e65d36567b318823de42ca628ace43d3833efc0cb28
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm that points to compromised WordPress upload storage, suggesting an attempt to host or redirect to malicious content. The presence of JavaScript indicates a potential for further malicious actions, such as downloading second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://aarushimukhwas.idealviews.com/userfiles/files/xuwelubimenozopugugope.pdf In PDF document text
    • http://adimhukuk.com/resimler/files/tamodofinulipefakiwasib.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/pavovem.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/jolilidewanibu.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161336660a1013---panojetoroladurotoveju.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/25058379803.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/levifabufunavajidinitoxi.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/cf57934b7415c00273c2f6071daf5721/danotuvuda.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613b47641d2f0---82003054202.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/40090882990.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/resenusite.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210901_135137.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/vavidikezobabuxu.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/xonibol.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/wafibedizimuxusuget.pdfIn PDF document text
    • http://signauction.net/userfiles/file/42284008908.pdfIn PDF document text
    • http://szjg.hu/images/file/fibufaxusovun.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161314f88c372f---6580766955.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/parupurirafinom.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/32394876533.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/gavemuxef.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/vabejexonivuzivaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=movies+to+watch+before+justice+league+snyder+cutPDF 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_off0000bc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC19 11384 bytes
SHA-256: 87167d1d77eb6ebee4041722f42cd0f0eec0dfcd2dcdbb77a23c5709d41fdc2b
font_01_sfnt_off0000d6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED1 16472 bytes
SHA-256: 675c7be50c32aa4def3ae665bbc53001d57c207a71eb3e6c678a12ddcb51abfe

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