Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a921ccac1d0e344…

MALICIOUS

PDF

89.3 KB Created: 2021-09-01 12:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ceee13f8bed18447daab3f045487c13a SHA-1: 525ab7e85bff68648c220d26c959ce7650347ff3 SHA-256: 8a921ccac1d0e34460c9a888ab8170b26549f1a0ca3f88166daf930514dd696c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. These URLs likely serve as a link farm to redirect users to malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://atolab.it/wp-content/plugins/super-forms/uploads/php/files/dc33ecfb73b7b14a0677800bce6da331/81973955279.pdf In PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/jepetenafakuridisiv.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/kikovebinixiva.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3818da9cab---55384549846.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/14972207260.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160708a46ace6c---vagudumizigo.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1611da3e2e8d21---fiwagilozelafegumologij.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202108210812567190.pdfIn PDF document text
    • http://dogable.de/userfiles/file/gajaveletapejawipoguxafux.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/pefusemuzipiwota.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8c2ac1b7a---sixerodowuv.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d2e790d58---95893913748.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/77209307272.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/sofuv.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/1ea055afc83b77773f5d20930e1566ba/nulapaj.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/3bbd81912587ea66b604197b5fa4de43/36927136751.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/43629173237.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d52ca617d---34201302761.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021062521453670554.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/kagadamejexunemuse.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2f79152e7---18968551819.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/0c5b27e1ba84e1cb18cbfc26ca556043/nuxonawumalu.pdfIn PDF document text
    • http://dichvuwebsites.com/media/ftp/file/zemosumejeranivulolofuzi.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ec4d32958---povulujejis.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe7e28c5a1---54673410525.pdfIn PDF document text
    • http://metallpress.ru/files/dabuloxuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=hectare+of+landPDF 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_off0000edca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 21908 bytes
SHA-256: ea5000ac83010b332a3357eb1064edc252c7265e94d6ba802935dbc7685159c3
font_01_sfnt_off00012780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12780 10200 bytes
SHA-256: 3bb3158ff2b3b6584855719b539700ddbae01818db97b60d6bd2bf0488f23d34
font_02_sfnt_off00013e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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