Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6298db9f0da3333…

MALICIOUS

PDF

65.8 KB Created: 2021-11-12 14:51:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d1139330b4f47f03b4a806f2a986867b SHA-1: 6381cfae5c2540ee905c5c51b0aa782d7eda3d3d SHA-256: c6298db9f0da3333dcd048c4785d11bcadd4e6976167ab87d4407e90aae2efd5
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farm heuristics indicates an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://clinicaveterinariaalbese.eu/userfiles/files/vubun.pdf In PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/66774964361.pdfIn PDF document text
    • http://saktigroup.in/uploads/lotidisejotisumupurejow.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/23268770327.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161896ded3bf49---53038365704.pdfIn PDF document text
    • http://p-energo.ru/content/file/80890840759.pdfIn PDF document text
    • http://thekkadyinfo.com/userfiles/file/21158965423.pdfIn PDF document text
    • http://anm-av.de/uploads/files/wijafudu.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/dapelipadobi.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/77a5dc26c474e62e5d0a6c9630ea88ea/firujon.pdfIn PDF document text
    • https://marosme.ro/hirek/file/8062858182.pdfIn PDF document text
    • http://cartopack.be/Images/file/rovusodugoraputiwuvovofa.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/33757961248.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/14599779630.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/eb5d866bd99e8860c7f48500341cf1cf/18225268974.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/00dff2psoucpj2180gi12u9vfl/guvadodopovovurora.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/29946279472.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///lufepojodivivu.pdfIn PDF document text
    • http://coachhouse.info/assets/file/larexovuzutifubi.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/rosanizixovevafa.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/5bhJmFgkeCE/uplcv?utm_term=index+of+latest+movies+2020PDF 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_off00009cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CF8 17072 bytes
SHA-256: 4e5858587c65805e4edce7b21f7f4596195811c1a7a14a751e8ebdfb7b0d89f2
font_01_sfnt_off0000c97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97F 10776 bytes
SHA-256: 6112ea13b76f05da946b7cde75b647baf69cd54f211381ac6952bfa325b69200
font_02_sfnt_off0000e264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE264 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef