Malicious PDF — malware analysis report

Static analysis result for SHA-256 54bfa47f6391d6f0…

MALICIOUS

PDF

80.9 KB Created: 2021-09-08 07:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b1c010fb561f3feb22e3098d2b7a3e75 SHA-1: 13e396c52bc63ba094d3217b5bff27596489bd1e SHA-256: 54bfa47f6391d6f0ea711032a96c08fbfd3259328fcbed5c8cb9554455cf7486
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://lnpro.in/ckfinder/userfiles/files/51846866028.pdf In PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/f94a63222887e632683d979b2b34e1f0/83902777369.pdfIn PDF document text
    • https://norservis.cz/files/files/31590752802.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/kajajeletar.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/92998052450.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c031f781acc---68895471487.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/rekovatomujazin.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/xasaku.pdfIn PDF document text
    • http://arablift.net/userfiles/file/kiwewijenovodalomukobo.pdfIn PDF document text
    • https://groupunsur2.com/contents//files/donitetosavigufosi.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/toboxoziwopajikitisu.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/26815791621.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/taftsa2o2pcj9cm4jkptjrcvv2/sekukugimaxododakidubaso.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/papajezagawesiv.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/80fcf2fc341d284592490df5e0209fec/delodirijadujizus.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/6635072413.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/nedavexawixu.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/d60aa32469ad59d775cdc2e991ac6015/xijemupojajepamituf.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/58079858959.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160864e2fded36---29768098248.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/13912341081.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e060f1bf1e5---gekepat.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/de8b920666b40e6af02ec75d3267f05f/53033025082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=no+tears+self+soothing+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_off0000d82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82C 10752 bytes
SHA-256: 014f2aacf6ca0a63485ae689e4e9603c14a3286c5d5f5487432b849d98340ba1
font_01_sfnt_off0000f09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AF 17436 bytes
SHA-256: fd3b023f84a9f93970099e719c9111806de5a2f207e5e154e1d63e569d3eb890

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