Malicious PDF — malware analysis report

Static analysis result for SHA-256 088766b916a846d7…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 07:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bd283dbd77bbcf1ae81601ed46340678 SHA-1: 38b0d0c2f2f6b098d879e1139b564acf44c59c1d SHA-256: 088766b916a846d77de81c5488204cf6a585e5a96fea61f0b449fe431c2a2aad
164 Risk Score

Malware Insights

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

The sample is a PDF document containing JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites, suggesting an attempt to distribute phishing content or further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/e193d6fa374054cabc44a4137b8d24bc/sulepodimine.pdf In PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/ninexik.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a8b57fdb3f5edaa96ff54b434075dd74/zarotokamem.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa73d7e33d6---mibefigi.pdfIn PDF document text
    • https://tivicom.vn/upload/files/buwemakuxuvifetapowuvakaw.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/kopawomokoleninigad.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/kemovudebewata.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/79371867827.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/78298225698.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/70967268094.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/bevapupobabineguji.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/28687891722.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/37200478143.pdfIn PDF document text
    • http://stfrancisfrankford.com/clients/9/90/9051900d87e3fdd5bc97eff612ac54c4/File/xipabolomaxevuritaxulajaj.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/rularaw.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/79355460875.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/67322121078.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/3303851875.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/vurifalewoluditi.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/sojesalewamevokulajibuv.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/38974841774.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/piwafoludarudese.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/fajigabavep.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f72a2cbee4d---vixopisajepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=salad+recipes+south+africa+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/64fb5c3be028d9a8090a319d321760ad/nalebofigolamab.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_off0000dd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD04 18888 bytes
SHA-256: b4e253c02fd3ab9bf03facc7698360a4208f75c57ac207e93c721e03c996434f
font_01_sfnt_off00010dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAC 10788 bytes
SHA-256: de8a37f87cd45c98d32a279815df1ddbf1e1270d85ee7964d7cd89e4f775236e
font_02_sfnt_off00012696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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