Malicious PDF — malware analysis report

Static analysis result for SHA-256 368ae62298ec7b94…

MALICIOUS

PDF

105.1 KB Created: 2021-08-13 10:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 2c982c1d0c260f281814fb9ff467bc76 SHA-1: ae864352928cd5333fc7e73b3caa3446d61c2c45 SHA-256: 368ae62298ec7b9443aeaa59333924a42e577702de850a0e62e5360590b9415c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that form a link farm, with many pointing to disposable or compromised hosting. The presence of external URI heuristics and link farm indicators suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or to download further payloads. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://61kidsclub.com/userfiles/file/97917939177.pdf In PDF document text
    • http://picart-personal.pl/fckupload/upload/file/moputebapovamiri.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/ratip.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/redewigibumugumilazo.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/8c2342b1ba5a77b20d086c63575193d2/82916798075.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/82612499817.pdfIn PDF document text
    • http://coffee33.ru/archive/file/99287333896.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/waweroxasekamon.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-29/20210429200743377120.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/rebumaku.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/sozefagi.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/sizodimibokivodoserape.pdfIn PDF document text
    • http://armanetti.com/images/dorirajozejonaluxodapuv.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/40205825500.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/duvi13pqnjv5p844dt3ghqm832/lunejine.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/18567830230.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b15caaf4a---38123822889.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd3b30b7ed---29455168794.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/fc8e0b9758654ed257661847f3f089e2/waketigoditaxepom.pdfIn PDF document text
    • http://indikino.com/ckfinder/userfiles/files/27046766375.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/27e7f39cc14b917dbeab95977ac45b63/12320197368.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/sofinikezivo.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/ip9k3rb1pjrn7pik4dascvhtin/xoxodovafosodumixedo.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/eee2e265e34589a028506a997028bf41/99620558202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=%D0%BA%D0%BE%D0%BD%D1%82%D1%80%D0%BE%D0%BB%D1%8C%D0%BD%D0%B0%D1%8F+%D1%80%D0%B0%D0%B1%D0%BE%D1%82%D0%B0+%D0%BF%D0%BE+%D0%B0%D0%BB%D0%B3%D0%B5%D0%B1%D1%80%D0%B5+7+%D0%BA%D0%BB%D0%B0%D1%81%D1%81+%D0%BF%D0%BE+%D1%82%D0%B5%D0%BC%D0%B5+%D1%83%D1%80%D0%B0%D0%B2%D0%BD%D0%B5%D0%BD%D0%B8%D1%8F+%D0%B4%D0%BE%D1%80%D0%BE%D1%84%D0%B5%D0%B5%D0%B2PDF 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_off000122e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E2 23276 bytes
SHA-256: bf3552425a0adaf4907a0f424505ac1b8e9419eafb84e12255f77e7f6efe62a3
font_01_sfnt_off00015de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000175fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175FD 11468 bytes
SHA-256: 56bfd426bd988ec4d37b5e284f899bd73199674189e6996294ef7e137d3838a2

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