Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6a0decfa1c9ed1…

MALICIOUS

PDF

98.5 KB Created: 2021-10-06 20:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: cca9974dce8023ad3e1a3eeb585d471e SHA-1: 49063aed5a94d93e50c60183b41d408bf0bc82d2 SHA-256: 2c6a0decfa1c9ed1439584b30ff701f87efa65a02affdeabfe9b924b89da9bfe
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is unreadable, but the heuristics and URLs point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://acmfashion.vn/uploads/files/51880132245.pdf In PDF document text
    • https://arendic.cl/files/kejop.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///bagowifurixudefisikeba.pdfIn PDF document text
    • http://annabarons.com/files/files/sulevofomudup.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/tuxadamexodar.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/wexos.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144890f2f106---gosefegopis.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/327d30316824c121148b9da0cec86275/vimezedarebiwuvajodad.pdfIn PDF document text
    • https://glozor.com/userfiles/file/kevele.pdfIn PDF document text
    • http://budka39.ru/files/kujipopajomisat.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/dozixowet.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/21856762487.pdfIn PDF document text
    • http://dienhoabacninh.vn/webroot/img/files/39217783742.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/tegonizer.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/mewilewumeko.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/90627532376.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/35955124.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/65727069604.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/keduwanejometitow.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/79542331026.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/bozajegokorasodes.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/06ad660375ca58d60e7b56a4d4d63e65/55278028821.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/91444678968.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/lilefelikugomesado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+the+past+participle+of+stealPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0E 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_01_sfnt_off000110e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FE 10464 bytes
SHA-256: 73e719026b6d0061316c7974105cdcee6b8d2b888952b6dd541e66bf5bee95cb
font_03_sfnt_off000140e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E7 23252 bytes
SHA-256: 79392124e4036247716339fdb77e00913ef643810b7f9b20680544fe435c961c

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