Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f354cf3635a89e…

MALICIOUS

PDF

85.4 KB Created: 2021-08-08 10:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27502e947a2e53e85d23cc907043feb8 SHA-1: 6a118dbd82fe65db7f372428b9687c3eb2429a1a SHA-256: 20f354cf3635a89ee2d80816283057a4f069c1c9eb3bbc8ffe47f6d595f493ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://bodymason.com/user_uploads/files/77856946646.pdf
    • http://highendschmiede.de/highendfiles/file/suwazupiz.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1ab16b0fa---fagusawarevisisone.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/d1ff07c6e6ac356b877ea249cb1c6075/bijesofotibebadoziduri.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/93673125427.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/6knb956g2vdlj1ub4jfo6t85b7/30993948920.pdf
    • http://jaatkinson.com/userimages/50794527071.pdf
    • https://office-agglo-larochelle.fr/userfiles/file/5207177408.pdf
    • http://urbancollab.com/userfiles/Proj_Name//files/fezur.pdf
    • http://dlt-nkp.com/fileupload//file/nebebetijiretelemip.pdf
    • https://avgdesign.com/userfiles/file/veloxolasalupe.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a43e9ab6fdf---puvuda.pdf
    • http://ahcxdq.com/uploads/file/120015215206.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076747697d5d---wamoforoso.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdac9eb9ebc---10552348414.pdf
    • https://actor-conseil.com/files/file/jabubijurigarogudiwudara.pdf
    • http://rdmsrl.it/userfiles/files/28601788189.pdf
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/26009551567.pdf
    • http://acpiindia.com/userfiles/file/wizolozezezo.pdf
    • http://www.euro-fly.eu/userfiles/files/16998458223.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/vgfl2d57g3ggrro7g3hbt648e4/62519483154.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=gramatica+el+imperfecto+worksheet+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AD 16792 bytes
font_01_sfnt_off0000fec4.bin
c5df4ba235c09a974bc9040b6e020c28847f3e7a8fe51d5bb36ba14b5306acc8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC4 10960 bytes
font_02_sfnt_off00011817.bin
b55361cef8e21aef3da2c3d4952530bc686e0e1478ed817f7d358767a6d2b33c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11817 18236 bytes