Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b8ddb1cbdfd14e1…

MALICIOUS

PDF

82.6 KB Created: 2021-09-21 00:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c086acfac4eacc7e64880d47f9054e9e SHA-1: d19cf240029f8c31c67f59bc3f73d46a3d6145f6 SHA-256: 2b8ddb1cbdfd14e162dddf2e23e2331d26f5645068023c7e66aec98cc97f7886
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, but the heuristic firings point to a deliberate attempt to host and link to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://huntic.ru/uplcv?utm_term=live+cricket+stream+link PDF link annotation
    • http://cosonhuath.com/hinhanh_fckeditor/file/towodizuponewiwewosigoj.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/36995969196.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/xinazibodofonaz.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/v917j55od3ovf6l7ni4330qurk/15824394337.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/nipibope.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/65053776346.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/63928448088.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/68113148660.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///91198675769.pdfIn PDF document text
    • http://guitarenko.fr/img/files/kiposa.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-19/20210919174315281318.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/73958779994.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/87962251449.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/2427737984.pdfIn PDF document text
    • http://klhl.com/userfiles/file/35015065203.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/83706627833.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/voposuniwupotuba.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/21084150573.pdfIn PDF document text
    • http://seto.cz/uploads/81158889755.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ptubv1b4pculid8gnaq8ijtul7/26121966256.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613983350d70e---8472266909.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/vemalinovukasariwatuw.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/fesijomijoji.pdfIn PDF document text
    • http://pronobile.de/catalog/file/xexuxo.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_off0000dfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB5 17476 bytes
SHA-256: f2f35c4374ad67309aa0459a97b8e4ede89c19c1f756e6ba6292f59d9d01f597
font_01_sfnt_off00010d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D23 10384 bytes
SHA-256: 3013d213172a0aaa13448614d2bd06e217d421408d8affd4ab2e1ae5ca52a3ed
font_02_sfnt_off000124a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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