Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7fda3bbea31278e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 21:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f6c4b5564da3de11accb8da8a1a2eca1 SHA-1: 287690862b625df3b7147542e22cbd5997d4a6f3 SHA-256: a7fda3bbea31278ec9114be0158eaca7ecd233cabf4cf7ffb041002ba964fbca
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, indicating a phishing or redirection attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests an effort to distribute malicious content or lead users to phishing sites. No scripts were extracted, but the overall structure and URL findings point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://webursitet.org/Files/file/pakuzesotol.pdf In PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bonexal.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ri5q21jio5qeg2jm10qapap2s5/97985522171.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/36334743301.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/70420632465.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5d3553a380c2b2f9e96cd2bb8f26d0f8/pobomexilujuxudopibokewo.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/86428785614.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/1932853978.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/kiraberejot.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/ketesep.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/xazewabos.pdfIn PDF document text
    • https://vestol.bg/files/file/16914165052.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/88780725740.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/vojixurutesejusav.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c2476f7f5---zivifapobaxuwelefusizeka.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e797c865f28---degow.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/f13qq6663ga63r75v9psjpd8h6/jovokosewofulux.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f7d5af4e15d---94417238354.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/30052451323.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210820103426.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160704ee421b47---90340889278.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/gojerilixuxakidudaso.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/sasezan.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/biwenozugexakurubomop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=two+column+cash+book+questions+and+answers+pdfPDF 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_off0000d72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 11412 bytes
SHA-256: b63fbd2cab00a6efbf81d05586ba4154b21c762a56071b232b07d2cbfde7ee91
font_02_sfnt_off0001099a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099A 17680 bytes
SHA-256: f030ecde8bd94c54aeeedb17d2201c850760f19f4f75af48bd0865ddc30dbe1c

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