Malicious PDF — malware analysis report

Static analysis result for SHA-256 161b0d1bfb205797…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 19:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 27b28a626c3f6ff5796654d2a7e29ca1 SHA-1: 1febd582b2d6b9ef809fd38a657317345e8c0e0f SHA-256: 161b0d1bfb205797cc35b0cc2541439320a95b45172510c73d6dfa0b5c6b0e0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or phishing pages. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=how+to+add+shapes+to+pdf PDF link annotation
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16130a4e8a9436---lunefawov.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/togunusetawi.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/bazexorudozopeki.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/81157886911.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/doditemomogaboxil.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/jeripesa.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mefosinekalawopoguro.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/43783746863.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140919a60534---47434573727.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/kowekidufuxugilo.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/98625751394.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/77368846237.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/70306807595.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/21446177715.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/79b17062cb15268d1827908af64131ce/99315573865.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/dumogozitu.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/b417ce4a5fa92fab8170b0d798d23603/wevilenoluvesab.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/74423632547.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161361e14cf074---51877723917.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138dd400efc7---11131404945.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/sekinifiragusixuselati.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/sovemorerixagolele.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/77009860634.pdfIn PDF document text
    • 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_off0000db5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5D 10328 bytes
SHA-256: 837803acd10199d68d80459c23d261f77221f949e6d881e9be5e6b4c8890533c
font_01_sfnt_off0000f2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 17908 bytes
SHA-256: f9ad1070769580a186ce710fb352c9b74870af3b68869a174027efa31c831e21
font_02_sfnt_off0001208b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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