Malicious PDF — malware analysis report

Static analysis result for SHA-256 b329dc99cf4fc52a…

MALICIOUS

PDF

85.1 KB Created: 2021-09-13 03:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 533a0d5eb1582cdf5abbe11884bd5163 SHA-1: 2319b61c6b0dd4cb40b9b8a117338121e35bdcc9 SHA-256: b329dc99cf4fc52a63067fafba6ddddc6d32993ef7d038de0412ea5f72b64997
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites, suggesting a phishing or malware distribution scheme. The embedded URLs, such as the one pointing to 'pavcargo.ru', are key indicators of the attack's infrastructure.

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 http://friulanamarmi.it/images/file/94584078891.pdf In PDF document text
    • https://clap-bas.com/userfiles/file/85698653592.pdfIn PDF document text
    • http://kammed.com/userfiles/file/sawasibazomos.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85359a5e4---12116511690.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/moponugapaze.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/20791801177.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/magafoxomixagalo.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210908034614.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/bulozivanuzemi.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210906_082509.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/94257029548.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1ff1a98f6---15935380214.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/pepolirepiperajulojuvuju.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/82322549748.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090702371317.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/risodel.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139dab7d7cde---gofala.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a03baf7a256b9fb33b44a881d20772cc/tobugujafipupewo.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/domoze.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/kuxewozogog.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/e93cd12eadc32bc655432bce988a99ae/38859231104.pdfIn PDF document text
    • http://surestegc.org/documentos/file/69196037810.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109100950297609.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=wheel+of+fortune+android+gamePDF 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_off0000e4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE6 19496 bytes
SHA-256: 49a5243c1b43ab4c19c43f5153183a0010429f6c27c9bd705c736735129acd38
font_02_sfnt_off00012ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBE 10724 bytes
SHA-256: 110cc75ad37072d3ed10a4a5255cda8634cf9ee5cd35f53e79991e6c48cbdddf

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