Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dafefeb38ae1b93…

MALICIOUS

PDF

99.8 KB Created: 2021-09-09 14:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 588867e93eed54e044629357f44f4552 SHA-1: c5e75e8b093a19532ff349a450fd836cb01a6eeb SHA-256: 9dafefeb38ae1b93a13a1cad4891b85b92bdea9bef3cddf845683355fe665abc
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=what+to+write+on+email+when+sending+cv PDF link annotation
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/pinivamenijakibovat.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/3217944545.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/juzokuzutuwo.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/nelodiwowuxigivizudapawag.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/ilfpaifk2dk567v5ufj0sbe5i4/damenirupeko.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bbdf621e2---bevefa.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/komapukodizafaj.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/68276465223.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613386cd1cedb---meteforonurez.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/diboroxegudiku.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34617051726.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/63549154030.pdfIn PDF document text
    • https://eclearusa.com/images/file/85134986092.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210901142024.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/12497368023.pdfIn PDF document text
    • https://fasleh.net/Files/files/63926808614.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///rununepavufafutunoponesa.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/nidopubogudegul.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/79401450015.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/48425810364.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/10692000565.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/kobit.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/sanuvow.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_off00011e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E70 18872 bytes
SHA-256: 9ce7d59226622338e9dbdd613d8943d9ca77042671caf05b36e8a8ec766c5d68
font_01_sfnt_off00014fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FB1 10960 bytes
SHA-256: fbf72f717808a491067391e403e3b7030e0bae348a2b8db983042d7eb906aa95
font_02_sfnt_off000168c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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