Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdbbfd0e0c287071…

MALICIOUS

PDF

72.2 KB Created: 2021-09-19 05:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5e6726b409cbd9e4f745bf5f9407bab2 SHA-1: 93e44152c2f56002cb76d32c3b1aa283d9a29ce1 SHA-256: bdbbfd0e0c287071d44bad859228a8f25d3ca617033c0121c20ca6603725acd8
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 WordPress sites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of a 'utm_term' parameter in one URL suggests an attempt to track user engagement with potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=guns+of+boom+apk+download PDF link annotation
    • https://mimpishio2.net/contents/files/gifezimeverodoximon.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f461554dd---bojagexixidizuven.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/gesibesifasilobitivalo.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/71660527979.pdfIn PDF document text
    • http://autovoda.ru/upload/files/tarevabid.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/zabivakim.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/lasenipezedobuk.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/36653881867.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614338f3dc6aa---42770130285.pdfIn PDF document text
    • https://cartolmania.it/file/sedilebok.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/812dfe1b6be80d1863e6c424672f0ebb/72223429241.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/xifivavefelisuti.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sofeledopapobivoruguk.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/vubusafusemu.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3e59827983ab4283ac6da61af50d65d0/pikuzuf.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/logivuwutafan.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/12870534253.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/18867887310.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/gemiwuwewosotad.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/80561712939.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/sufoxubibus.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/10149040333.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/45093465657.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/sejagavo.pdfIn PDF document text
    • 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_off0000b88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A1 10696 bytes
SHA-256: 094137b328f7c39d30d59e91a1acc45fb7f24c11915927edf9d600cd1a248122
font_02_sfnt_off0000e90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90A 16584 bytes
SHA-256: 4a28b55daad507b3e8ff393f13b5473c6c79725844c4fa876b20ea3a75c79c67

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