Malicious PDF — malware analysis report

Static analysis result for SHA-256 10182d29c10266ce…

MALICIOUS

PDF

72.3 KB Created: 2021-09-23 09:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4ceafbc4cf85b77e510858586b837caa SHA-1: efcb244b43231a7c4dff62f6c980d096a337f397 SHA-256: 10182d29c10266ce6dca8b8ef79e8a88941c8465d078fcbc40da33abc78be181
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://eletvital.hu/uploads/files/vekefigifunijif.pdf In PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/398b3a2b788756c048bf3396b7faeade/74231026739.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/jqk1br9svck7fefrmiqnp89bqr/sewizufez.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427d2f70cb2---zukipogamegofene.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/cac4cc6aeaa5c0836c83dc303cefe69c/nisinozokek.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/8706531077.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/babaxes.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/wojusagosixoviv.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/nabizezaxi.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/79076758941.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/gutopijibokizal.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/16318150953.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/46411231387.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/29241630062.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/28567293173.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210918025330124.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/40068740230.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/45881842688.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecf13b0a26---luzawajananewe.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109111101155478.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/pejeti.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/zoxelonuvekuvelas.pdfIn PDF document text
    • https://fuoriscena.eu/file/6815691932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=decimal+16+to+hexadecimalPDF 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_off0000ba08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA08 16148 bytes
SHA-256: 5b400bd5cc5356fab87e433f73f1939e19ae025f0ca1224b749831b648d64640
font_01_sfnt_off0000e380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE380 10588 bytes
SHA-256: 7bf5b8ac5aad524371127ae6bc228a96e7517fbdd8a4913953c7bc1ab5973614
font_02_sfnt_off0000fbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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