Malicious PDF — malware analysis report

Static analysis result for SHA-256 e031d83bdb2203fb…

MALICIOUS

PDF

96.4 KB Created: 2021-09-21 17:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 98109c486248f5001598a67c3109c814 SHA-1: c01ff6d772306fcc7b41e6d8a665bafdc9bc3c9f SHA-256: e031d83bdb2203fb0a925f56b808f06835e4a7a8d13efaa7c44f093c22fca915
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document body is heavily obfuscated and unreadable, but the presence of numerous external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://car-zone.sk/data/data/file/sufojodamelutekubefut.pdf In PDF document text
    • https://esofagopisa.it/userfiles/file/96681740819.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9938b0c5e---27070145293.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/dilage.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/74197599527.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/93896916145.pdfIn PDF document text
    • http://spakimthi.com/upload/files/19195014561.pdfIn PDF document text
    • https://petribax.com/userfiles/file/febokelupolurekava.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613352d285310---31567741709.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/18169901266.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/89121981665.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/39135000664.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/zakixodusofuper.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/92921842711.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/39520579545.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136958fbae3c---fevukizofufabenilu.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/wexemabev.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/74259854416.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/rogoxabatexilososajep.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/fesezuzo.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/68531688518.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/11326877090.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/jebojodivamenatanategiw.pdfIn PDF document text
    • https://medius.sk/userfiles/file/lotagevudanijokalurixure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+twilight+saga+breaking+dawn+part+2+full+movie+freePDF 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_off00010f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12736 11512 bytes
SHA-256: fa1a457a6469c13f22199b4422ac0b9e9b5ec501c021d9fe90af38f3031631a1
font_02_sfnt_off000141fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141FC 18868 bytes
SHA-256: b9102215b7eac280f0e7331fba28876be4e242e639cfc58a1006e14d683f16d7

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