Malicious PDF — malware analysis report

Static analysis result for SHA-256 540fd98d37e88756…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 04:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: acbce11df3d05e120031eaad0d156ec3 SHA-1: b5a377c97de47a354fa79d5d9bc8381b78e008e3 SHA-256: 540fd98d37e88756947486063627189368305df2ac277927a0390a543c1c05f6
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The presence of 'utm_term_redirector=True' suggests an attempt to obscure the final destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://union.travel/ckfinder/userfiles/files/94253613116.pdf In PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/vinujawetapufiledigebut.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/nipesimumulurisosajo.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/78001116214.pdfIn PDF document text
    • http://iphysiology.ru/upload/jusebubewuzesekij.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609100bc523e1---86084164985.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/kafezuwenozarovixepumim.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/34704836515.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/jojexovejulupagawivelu.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/39855473527.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160723fbf8ff24---temujisuwefemamob.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/9d3809klh8trkjoe7plld1h5m7/vatekozoxapidipu.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5ad66259e---9215972846.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/jazuxotutadarazota.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/kelibasolekijazowi.pdfIn PDF document text
    • https://healthandetc.com/ckfinder/userfiles/files/33197234035.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1c97d3f6f---71431939918.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfecc0ea024---reziwutugeverotefa.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/vesezoverixebikanuwin.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/40053042356.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1611eba86a6cb1---28558068244.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/7h21aaf832m3sn48chsk7ntnf1/tisiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=magnetic+declination+formula+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 18116 bytes
SHA-256: f0b67909802b502ff9d27edb59f4f874c573618c97d2be187a3bc6f06ef7b85e
font_02_sfnt_off00011c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C24 10888 bytes
SHA-256: b03a6dbcd976b5e2d0c81eda1edd585a1ef8b966fc35f059b81e60c11ca845f5

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