Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a30f18cef46a918…

MALICIOUS

PDF

72.3 KB Created: 2021-09-01 10:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 95f823346fb8bed75a34608a1077c9e4 SHA-1: 4a42c71b5b165a5bbce6719e1762b2fb5bd95547 SHA-256: 5a30f18cef46a91886328895632adf162397682f4411bbe84b43d42f7abf0189
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to websites utilizing compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL analysis and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/3a482f226baee2f0c832b021c5a8e649/sesoziluzitigoxubaletaju.pdf In PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/fmd2pd1uf94df0p8d7at5b1ha3/texigazewigewuliraka.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/6522874902.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/taluneveriletugoku.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8b40138c5487d57ad9fdcb6990d54047/venarobar.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/69093078092.pdfIn PDF document text
    • https://mollis.rs//files/69796965006.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080aef2ef977---lozaworidowaxen.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/406453485.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210829_8EBD350BB284B762.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7ddb0ada68161c0cdda3b49b7653567e/28710000211.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d66f4df03---rokatujubatikig.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/52902669797.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/c4a8f1cb7ee27219adb1a26b00147bc6/naguxewegujarezulo.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/52817566692.pdfIn PDF document text
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/xobevuwulederudo.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7610660595---76918754487.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/04c76f61426a6f0d5bb1ac978f7c7d75/rafekomarajevadavij.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/817ab521d1569d8b8fdff70dbd45a394/xaxadexaluredamiw.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/4ce74795d8d9315ad347fa1b2f99b953/47705434396.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/93421910101.pdfIn PDF document text
    • http://reflita.lt/uploads/files/mawepeme.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/85000072059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=best+reviewed+microblading+near+mePDF 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_off0000b6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B0 11056 bytes
SHA-256: b77e14230f3bbdaf156d513ef13f70671424a30652a9cfe41284052a3482e3b5
font_01_sfnt_off0000d053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD053 17116 bytes
SHA-256: 666c2d63c289de1bdfc0255be32ae697587f3fa9319d266e46e420586e490b37
font_02_sfnt_off0000fc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1