Malicious PDF — malware analysis report

Static analysis result for SHA-256 456c95d1bb5e1d55…

MALICIOUS

PDF

95.3 KB Created: 2021-07-24 01:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6cb44a62d8ff153b465c65722e30bffa SHA-1: d9395161f29cfb345b777dfbee4bc94e2a8bd518 SHA-256: 456c95d1bb5e1d55d38c3e01d6bea7c6bb47959a513c03b49c77efe8e12202ca
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the presence of external URIs and the link farm structure strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5e41e20da---64948299604.pdf In PDF document text
    • http://monkey-do.net/userfiles/file/mifegolafitivojagopezetob.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e95a09253---zaburopejisegipe.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/61097083219.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160701829ee686---fewetifepipun.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de2da5cd139---novipujatagakalojebibeto.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/64675337163.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/75503113505.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/zuxopavugeleradopobolutej.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210618091815_1023949755.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/zafugarizafugaraboroni.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b432225f645---45584071186.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160982fed9a9c7---5158733671.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/viven.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/sodumetojilinijurorezi.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/dijulenuse.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/fosigororuxozutadikogamol.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/19089559604.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c281b78d1---fidodojafoseg.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dba517ada3---xakefodixa.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073af40614e6---49156403805.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/0d777a958d27c9fdda6504ca02655309/603214777.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/56impkicek6egfsn6eur1iu1td/bazoparunodexurewem.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcf2a4db9b---metosomudebadi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=direct+object+pronoun+placement+spanish+practicePDF 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_off00010ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE4 18272 bytes
SHA-256: 813188e141ca3c6115b03c8fa04bab953cd2395d2320bae7e63829171f6afb33
font_01_sfnt_off00013d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7E 11008 bytes
SHA-256: ad8288013cf53823e65b189488ce2cad977ca5703d5a8913f383b39572d16f49
font_02_sfnt_off000156a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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