Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80b526948fefb2e…

MALICIOUS

PDF

94.6 KB Created: 2021-07-23 07:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0805bd71f5448997c1c641f9c4c269be SHA-1: c5708aa8f6c6cce2a2a39db12347051e588ef514 SHA-256: a80b526948fefb2ea888ea701f6b5c580bcec42b0b61f290a8bd77250604b93a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is designed to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

Heuristics 6

  • 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.
  • 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 http://www.abcklima.hu//data/editorfile/kukamakivefizejukijinip.pdf In PDF document text
    • https://xn--nmqu14inmf.com/upload/files/komezakizujorewimijuvanu.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/462574862.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/joladeweturit.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/budumiraroka.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084126e86c21---kevaz.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/215f12ef5050a5523c9a1ce0c6556b8b/14800738517.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b1307568b---97368411753.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f51a0c1308---sisaratavigajapalu.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6840199c5---15733390045.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/72012098514.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a6a4e2301---24548164148.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160716835b8a5a---riresabafuredinokuku.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/safifemuletesiroveb.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210528_184552.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/zedejamoxopukeful.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/zunit.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b73210a6731---55419291784.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/61117548864.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d12e0876c5---lepufegetenapojamiluvugan.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38020dd3f3---natakaduxuk.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/21498556462.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/a4ca5d811d2c7f88d9df370de25d14fa/82931601335.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/43355494621.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/eb919s7vbp23gmq7lne3n503o4/mejajorefemu.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/kazuvalemol.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/7a8455c681232ec5e0bc663b296dc185/77048590035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=convert+excel+to+pdf+offline+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001114b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114B 16076 bytes
SHA-256: a671d37c7b3b889284622d243fc9727f378cc914a66da79eb58e164c6b93b0ed
font_02_sfnt_off0001266e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266E 10484 bytes
SHA-256: 3ef474a299cce44ee8888ec029a0a200a4376070ba285a0a70d745320c8b663f
font_03_sfnt_off00013e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E64 16784 bytes
SHA-256: 49129207cf485d0d3075ce3672ea995776c27c8e142df4b165ab108fdcee3a0e

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