Malicious PDF — malware analysis report

Static analysis result for SHA-256 3552958c1fa68ebc…

MALICIOUS

PDF

78.7 KB Created: 2021-09-20 11:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a813e5985106847b38428e79c4c63a03 SHA-1: 496c46e4d1fb3273e7bf0dff3742296698078929 SHA-256: 3552958c1fa68ebc7b9b65d324a4251cc2d15f99cdbf2c985b3884fcd68d5d18
212 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URLs, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content. The presence of heuristics indicating a 'download button lure' and 'password-protected archive lure' strongly suggests the document is designed to trick users into downloading and decrypting a malicious payload. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=file+garena+free+fire PDF link annotation
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/26496d3bf80ae5ddd71ad74dc04cfe01/tejoxubosuvixezipi.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/cd86c29dd5c2106d53e30ecbf1ff87f1/51826217665.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/61300058072.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161393cf1c5380---vufigijezilofobinakosub.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbaab1eaf0---32207228448.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/sologu.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/92340960633.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/86028016859.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/lejokipilif.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/japixagenemawarozexapofu.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/89708833208.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109011625293693.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/dolixazakedelu.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/21582344946.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/94194006501.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/tatufawuwowofamatavopufi.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/95473107199.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/69961146055.pdfIn PDF document text
    • https://limsurempat.com/contents/files/nufekejanawisopud.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/48273318841.pdfIn PDF document text
    • http://schokozentrale.de/idata/budajut.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/piguranelapumegiludes.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/11871988839.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1261cc147---kubureruzaputaj.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_off0000d1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E9 17252 bytes
SHA-256: 356ddb86ec3f18d1daffa3ce626d3fc791a4fa061b5c087fd554cf8bdcf3483a
font_01_sfnt_off0000fee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FD 9980 bytes
SHA-256: ed06cd605d8e4a567a53ba4731550f841eb75ac11bb1f85ec0b907f556926196

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