Malicious PDF — malware analysis report

Static analysis result for SHA-256 95890fd76b3e31a1…

MALICIOUS

PDF

84.4 KB Created: 2021-09-07 14:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8cf658595ec06ec4e250103a2ec52ac2 SHA-1: 61b49361953fba780ac26ebc99ef51a94e4e822f SHA-256: 95890fd76b3e31a1728090d6bc10f0eeb4828aad82a5219e5e09b15d4ab8910c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. Several heuristics indicate the presence of link farms and compromised upload storage, suggesting an attempt to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alamansyria.com/userfiles/file/61814933080.pdf In PDF document text
    • http://wecans.net/_UploadFile/Images/file/3579099365.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/cf44875b2ae8932d1f8a7d46af248801/ledupewutufonugapimawamo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c65d6e1cc45db4cd5a6f8d3533d41023/5066590465.pdfIn PDF document text
    • http://phuongninhphat.com/uploads/userfiles/file/vusafexasepodenonedox.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/tuwogukekewodok.pdfIn PDF document text
    • https://securitydm.net/slicice/file/komudarolavejupoteda.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/zujofanulupixonubo.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/moluzudenezor.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/c83fb94152d18a8b166bd532035ed9b6/62706651975.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/xidutedoni.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/vurasiporuni.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/34654168003.pdfIn PDF document text
    • https://argumentua.com/i/file/perupigozodametunone.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/nusovugekexaduzareb.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/fuvurebozuremudewosuda.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9445f0d0ef---xizanotexe.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/6db23944807980e279dc0c352f581b18/3215923728.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/pelisuzumel.pdfIn PDF document text
    • http://ausafe.net/images/art/files/deguzi.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/9063114828.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/rugoriluxutin.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/60472073597.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa381d3cf2---jegex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=free+true+colors+personality+test+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_off0000e703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE703 10804 bytes
SHA-256: 741aff098847ee90851272408486d50939fad7dbaad2f2ab78fc3740586dceab
font_01_sfnt_off00010008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10008 17196 bytes
SHA-256: ddb6dcef74f5af82b375a81cf9f3240c9472d30f3fae192a1bd21d03364f1934
font_02_sfnt_off00012c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1