Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac51192a30a7dcb…

MALICIOUS

PDF

92.0 KB Created: 2021-08-03 01:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9950c0989ce35195c1378df45ec97714 SHA-1: e91424348b566adab4f6729c131d97ae504f8a09 SHA-256: bac51192a30a7dcbf64648af8824358d7606e047c0aa0d809d4b1a375e3d33a0
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute traffic. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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 https://newtech-utm.pl/userfiles/file/dobusovabadolov.pdf In PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/av5oeulv1pcqcga5sqq9rq26q9/nuxulusir.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/55543035759.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/697977907.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/tukajikowetogekofikixufog.pdfIn PDF document text
    • http://sadex.pl/fck/file/25254066616.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/vag88sfci24omau357d84bgnv3/tinedi.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/47694234383.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/luvepafotiboma.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/5550184862.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/luzapumonox.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/suzifojewopawakapupiw.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/6bea8f5af43ba534c54358604745063d/posidopututagegemur.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/mazoxiporafixi.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/4be574f1cec386698d5fc4a4652d67ea/52826715596.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/46485260330.pdfIn PDF document text
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/16564979313.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3e0d75bd9d.pdfIn PDF document text
    • http://deborahbrown.us/clients/860103/File/lenelirifaposar.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c721acbe---xeporipu.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/3c3q488kaqa8dbh0md0eetn407/zamipuredebugisemin.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ff30f5b8229615a2c0447d4ed839ec99/bowusafiviz.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160714591988c7---47218182481.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/loledal.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/de68eca865909131d35a123c5ead11bd/67733529927.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/bcaf7220f3c09b63108fc703b727662c/31752017625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=kis+kisko+pyaar+karoon+full+hindi+movie+youtubePDF 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_off0000fed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED1 11268 bytes
SHA-256: 41fbeaa34369ef35d330c71b9c0be0dba2ce3d4d18750a2648a08ebfe0118bb2
font_01_sfnt_off000118ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FE 18144 bytes
SHA-256: 5ede34e37d4dac10085c49411245da77613474c2e3e79aaaa1d79d52da36c172

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