Malicious PDF — malware analysis report

Static analysis result for SHA-256 027e2d50782679e0…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 23:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b5292bd7781a9b925385e61753555e10 SHA-1: a8eab9f2b2d99f9b8933ce16125ec691ed054d5c SHA-256: 027e2d50782679e08a4809c06795b8107a43c59f9db945c96351084158ab0a38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The heuristics indicate the document functions as a link farm, directing users to numerous distinct hosts, many of which appear to be compromised CMS uploads. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL distribution suggest a phishing or SEO-based malicious content delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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
  • 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://huyminhplastic.com/upload/files/17577939334.pdf In PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/wubatobunudeza.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/49eb033d005592fa582ef0e4acdeca1b/49169145838.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/5lvlbst4t5rrv1brbvkeacj2m4/tiganufutufojalawarupa.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/b5c4117f77a8c0d2493bccfeb142a6d5/rubogopev.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/15229073649.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xipitipirogapodukesabepur.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/kolabeguxo.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/66123756685.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/4269017505.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16089f8bb449e7---notujevibukurarulorukepoz.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/34799258321.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/84134291733.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/5ba1acttmo9off3s8bo53h2ap1/62218191244.pdfIn PDF document text
    • http://twtime.com/uploads/files/202108150828309144.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/futenarifumigoraza.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/velufudadubomuvuvetadut.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116bdb21d78d---gefofew.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202108291457325359.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/a2110416f70b138493927508b1a53719/32762081719.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/11s56tb5mgh375nvng91ic27d1/jitegu.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/65583060285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=convertir+ppt+a+pdf+online+gratisPDF 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_off0000db4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 10768 bytes
SHA-256: 7cf7686c5cd20ecc66b17be8415fc9b95e851f253c018f002f7d2704cd655395
font_01_sfnt_off0000f40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40A 17676 bytes
SHA-256: 37898750d1ba56eafb1a9813f235bf20864006b3eed0e360891d7feec316212c
font_02_sfnt_off0001212c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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