Malicious PDF — malware analysis report

Static analysis result for SHA-256 866fd7e6e0a7d677…

MALICIOUS

PDF

85.2 KB Created: 2021-07-08 00:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5656579f0596c4f72bdb08361587b848 SHA-1: ce85b466f4e26daed99dfd985390b9d65ea6bbae SHA-256: 866fd7e6e0a7d6771da8294d21b18150fdea51636a0db6f5e38e82096786e24e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or attempts to trick the user. The file contains a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of numerous external URIs and a link farm on disposable hosting further supports its role as a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/r9j2mq9sfmgg0i2ahegru3n2ad/96530321665.pdf In PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dd91a6a4f71---1884369392.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/2938269355.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/36143847255.pdfIn PDF document text
    • http://zuche0551.com/upload/file/20157721805.pdfIn PDF document text
    • http://dso-fuzine.si/docs/29094016227.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/qh5p944dr0enj5e737cpqg7am3/3854803898.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/948a2562328a6460199cb40c0f77e904/94464822165.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/ruzofunigaxuv.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/dijaritapuxuximavasijopuk.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608d86a16234f---tojekuxenekogenagak.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c4337d9b0---lilimurijetakalubebaf.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1606d11f334952---kadogolepu.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b954f4679e6---62779108510.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/35abfecaa6ec813c6523d0c60d74c299/wanegesafisutod.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/dd0b5a76a9037fc1583ffbd438c265be/dajugorireraxibimawoxit.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79bbb75c4---79206414472.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073939207ac7---niner.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/fba792f20fea3abcf1a9e237c1341152/59751685697.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/89dd42c95118bc22fc2a0b90682ef60a/62510114781.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/patufuseviruz.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210610_00248E28BF93090B.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/zadazub.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dd5f2663489---87343266571.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/30564762110.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/colch3jfa7usjqo1l2tsggbf05/tabisakudinasuwafato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=switch+trunk+port+configurationPDF 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_off0000eac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC0 10764 bytes
SHA-256: 91bf26c75f3dc3a6b4b999a2ba8ca0ec771821ff74c5cf24bd71d27ae0aed9bd
font_01_sfnt_off0001038e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA0 16900 bytes
SHA-256: b29d4b70e62cb102a083253e078eefd12003942db6ccafb8498b5bcab003c81c

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