Malicious PDF — malware analysis report

Static analysis result for SHA-256 c251f681a0e00c9a…

MALICIOUS

PDF

75.0 KB Created: 2021-09-01 21:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 21615728b87aa2bd7d7ed86e087db350 SHA-1: 6811a7b5502a7780c8058b07f77956a840b6abc5 SHA-256: c251f681a0e00c9a7c453ca2ec4e999fe1eff82a46f7beaee8a12b08392258e7
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

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 http://blfimmobiliare.com/userfiles/files/figizinovun.pdf In PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160af9a2728b8c---62784935009.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fce46c17b---95531885691.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/pegugenujipofinutosutire.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/xukemamuwutuxijikofa.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202108282351273090.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/12151216771.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/fnqaff0l6unmvehnnm08t19aje/jutupukuravuvorunar.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/39946359263.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d6757a6e9---rasifafoxomum.pdfIn PDF document text
    • http://wernitznigg.at/files/zavakeve.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/6e6b6f6aba44c2e2640d425c3d22746d/41378312199.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/maromu.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/25609332757.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/ramaxujunexobezonovi.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/vorhekdpr3bq4of6i4eq838334/wugorejida.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/25028283197.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/d63e613d67f2e8117fe2c5d6783227ec/6721766910.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/37515772424.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/begafawa.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/58773f578b924bb6c6bad37ff260ef97/watazilawatotuj.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/wonemofukomezazase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=c%23+cast+object+to+stringPDF 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_off0000c822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE038 9104 bytes
SHA-256: fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804
font_02_sfnt_off0000f305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF305 16840 bytes
SHA-256: f716de133ed1d49499020142c7b95a0f924bba9568d9ef71e46fe51d9370a997

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