Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba1e3262197cada…

MALICIOUS

PDF

74.9 KB Created: 2021-09-04 08:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c11e7fabca14f9e5cec8f8f7fffe0f24 SHA-1: 16fc8e27a674210de00acca372794cb94d4a384e SHA-256: 0ba1e3262197cadac99c0234482dbaa3955898052c26d5457d46b05aa8a98480
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous links pointing to compromised WordPress upload directories suggests a link farm designed to distribute malicious content or facilitate phishing. No scripts were extracted, but the overall structure and heuristic firings indicate a malicious intent to lure users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c018ed825d7---kewozapefisalaxatabomojiw.pdf In PDF document text
    • http://www.look4job.gr/images/_user_na/file/53148919590.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/lunidemazu.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607782b962f42---kakovum.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/19b182d5d6728a8a7bb5c0c5ea45eb9a/rerijaperumapiviverez.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/nuruxulafibexito.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/64101562723.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/6dcf798e8f7a1f4e9db347905b912fc3/tilirutufenadit.pdfIn PDF document text
    • https://ckmandarin.com/uploads/tiwuneledafivowojinip.pdfIn PDF document text
    • https://mmszke.hu/files/file/9802634550.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/e66674954a2cb40373f89f00c0d6dfd6/sivaninesudozetixud.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160780e488375b---11299664021.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086d040ba7b3---vogir.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/35109963051.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8b5e4bb13---83679839626.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16093a24ac06ad---numadoj.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/0fh34dhfmvha54pcs8sbsp1hsg/95401048447.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/vugitesuka.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/65338412101.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/sevukabukixebidakurap.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87dde2469c---37807480446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=livro+poliana+pdf+baixarPDF 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_off0000bf5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD774 10356 bytes
SHA-256: f567dc41890e4b511d77163f95fc98d3f9cc52dd5c07f72552ff2cc36a979cb9
font_02_sfnt_off0000eea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA4 17764 bytes
SHA-256: fd6ef5c059475f03eece87736fd8f0c689a5ac531258593f6393474b5c6a9c40

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