Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5b5e356cbd00e9…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 04:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8996c7acecba9bf1e7af9250e40bbe42 SHA-1: 01a6212990605ebf6a6ae435c16a4330535d15fc SHA-256: 9c5b5e356cbd00e901eba62b1906cf62fd82a85aeae567867cf27333c2e90a45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to domains that appear to be compromised or disposable, suggesting a link farm designed to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pixomot.ru/uplcv?utm_term=libros+para+celular+android+gratis PDF link annotation
    • http://epoxidice.ro/mm/file/kaletumufozegodefiw.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/kiruxevojo.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/87364160288.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210910_041243.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/14571477949.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/751053ca27b9af2e9f1a78a91d05eb8f/85746006977.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/63581515823.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/dukutula.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/1u2dgtcak2qmdi6if5rkkbpkn7/bevudojoxirupisulodalava.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614203e637569---wiruwuxizanasugod.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/bubaxinitewoxenigogifa.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4bff20ac8---nunuxejojufumodugad.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/90375345154.pdfIn PDF document text
    • http://artospace.com/pics/file/bewikirupurepawutej.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/jezebigulisis.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/55506270853.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/januvolozolefu.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/1505192353.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/beviv.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/wuxumeloxegijakonunozamu.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135004d6f558---4679051185.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/55501489321.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_off0000da44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 19024 bytes
SHA-256: 2093fbae9f8fafa68f43098222eccdd4abe03b08587dcc57253b230d827b0aa1
font_02_sfnt_off00012301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12301 10888 bytes
SHA-256: 8b3ed57f07a3c18cbc2537e4173b52ea6ab94a8a83da1d684e4df98ae20c26f9