Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95b3ece1f4f8e90…

MALICIOUS

PDF

75.2 KB Created: 2021-09-15 16:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 09a3fa80f7a0df34633c52cc68291570 SHA-1: 84ad6ffea1beb91e58f0a37706ab8bac35dc9256 SHA-256: b95b3ece1f4f8e909b78955b821eccd8c3fc0d301b0d63af900accaa2ac78f03
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://matfplayer.com/calisma2/files/uploads/86831086968.pdf In PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161358845e535b---dewasodorubaxuxaxi.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/84472630768.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/pipigizizen.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16139d2c7cd1b6---buzenum.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/mevatanetomojonefenuxebos.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/85731155740.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/bojobig.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/viguzirepuwupapadu.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/83555537944.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/90729968304.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/39525280209.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/julelinoseketajak.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/bopabivu.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/fqr1cr27sqnl3ek5rgmhh7s26s/tofatifumenovet.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/nepurux.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/pakubibawokomafemen.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bee235671---kivokilopex.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/supogojobewil.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/86333463439.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/72694215162.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fewita.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16137b522e5f48---61025157989.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/mevigetazibanagisaxipu.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/de6e69993fda14e47cf00ee4045d65cf/17410942595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=indian+web+series+app+apkPDF 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_off0000c3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F7 10392 bytes
SHA-256: 8468c03a3cdc643c8925a1ccd7643936ce638b7c4a991d19dbd00712e232c0c6
font_01_sfnt_off0000db62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF374 16976 bytes
SHA-256: acaade0079bd5c1340e5c4fdbac36f9670f1901a08364e0cfbc05de9454327fb