Malicious PDF — malware analysis report

Static analysis result for SHA-256 37cd4d4c124fdaf5…

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 10:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 37d03b41fc16a35af2761298f4f1dc10 SHA-1: 635f7f49d78853704aa6220355de517ee830ec82 SHA-256: 37cd4d4c124fdaf5eeacdd49df109a83c1a7caa2921885e9f08bfdc34e647740
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of heuristics like 'SE_PASSWORD_ARCHIVE_LURE' suggests the PDF is designed to trick users into believing they need to decrypt an archive, likely to bypass security measures. Numerous external URLs are embedded, many pointing to compromised CMS uploads or disposable hosting, suggesting a distribution network for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://wastran.ru/uplcv?utm_term=sweet+words+that+start+with+h PDF link annotation
    • http://clairerolo.com/userfiles/file/79069094427.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/21136476724.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109090418213063.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/18136311190.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/mezuzaxi.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/9kb2s4j7eicfdb8v8uisa64uro/sivavusonanotuxujo.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/fafoz.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/79188262573.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/132047464397.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bdbd808a5---45350769434.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/pobedukepowu.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/35165921826.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/696ed97b014f926ac80886278cd19a4c/76476203699.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/94263955738.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e0adc7b07---12080169191.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/1461148909.pdfIn PDF document text
    • http://e-sportis.com/images/upload/nevafadefam.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/59839581323.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/92513756592.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210914_D44BB85EC15DF14A.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/83062664592.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f195b4c39d---9642622219.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/lirurujetalemedabi.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_off0000d0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A9 17548 bytes
SHA-256: fb6f85283093754dff0bd03c966a3359e43e8dae8f6960ac80e820b7112ef00b
font_01_sfnt_off0000fdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C2 10356 bytes
SHA-256: 37557ee1a24b2ae9e14b40793266645061631ea6877d47de1b9f0c1c79a052e1

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