Malicious PDF — malware analysis report

Static analysis result for SHA-256 779fa1473be82c51…

MALICIOUS

PDF

71.9 KB Created: 2021-09-03 00:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d25827fcc3086e50d686a975cfe21e66 SHA-1: 97077455027cfd21e0710b9041cef741ee5e9787 SHA-256: 779fa1473be82c51c2c3bbfa912c884155c5b37d115a8006941f62d0f4fb4cbd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains. This structure is indicative of a link farm designed to lure users to potentially malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6691

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://assignmentmart.com/ckfinder/userfiles/files/radinenevutokodagid.pdf In PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a1339ec71b4---dotigukepa.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/genikotikakigeli.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/81220092416.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7893501cdc---70158380258.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b1637574e5a427e7a5b09b639df0a122/fomisixevizal.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/nasilewixukigesijoni.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/7130047578.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/64358590127.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/jowaruwilijumusexonuwe.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/fitobexabepoposozijolep.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/f31d5e477420065b7d21ee8448848a0b/40833441353.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c3a9db193421be6109069a912fbff765/jipegofulebivodurawojenop.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b236c219732---31045153148.pdfIn PDF document text
    • http://www.toptehnik.si/images/ketipenidisupaseziv.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/52032460648.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/0f8178bfabcab4077ffa82bd460191ef/99350255882.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/25524015295.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/740dca59305dad2ea766075fa4710b76/finofanijikazuwuxuwigivir.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ce1e858a6---ximarigozelom.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fijaladesep.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/kprif42srnfp1brj5ldbo4erc9/kufifimatowibejafu.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/zezedebejod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=behavioral+economics+guide+2016+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 17532 bytes
SHA-256: d5e68a5e2d3c176702deacf505b43d409a5c8c16433fdb32b88a4eddc278cabd

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