Malicious PDF — malware analysis report

Static analysis result for SHA-256 30da6f5998a634c9…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 16:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 5c3e044c212046d664fbb13a0f11b365 SHA-1: 041d1dbc0db1a544a6eeb856df822e6217b2eb8f SHA-256: 30da6f5998a634c9eb948028cd8468e9a9df9bc1bde4d02bc226bc174aadafb5
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=mulan+free+hd PDF link annotation
    • https://newline-eg.com/userfiles/file/10197419347.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/pajituxa.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/nisudisaguneli.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613421e64f1c1---wivexidanez.pdfIn PDF document text
    • https://faceless.me/userfiles/files/zufuw.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32498981414.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/15504956451.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1631120054.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/12899650828.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/59456266925.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/sutuzafepudulogav.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/zuxomejetirezi.pdfIn PDF document text
    • https://netlandschool.cl/files/xazim.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210904061218300686iw8dj.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/36332340399.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/71604876829.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613667dbcf231---kivajerurijixuxedukef.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/dubex.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/92288350961.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/a3fsjvc7p6s2uheh7ecr8l93n7/tofegerovozibemumijov.pdfIn PDF document text
    • http://labsshop.com/d/files/29034507153.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/xixivonelagesudujajagu.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/43712344906.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_off0000d9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F6 19432 bytes
SHA-256: 0add0c78c23a73b31dbd8ba8b199ebf1aa603d9b36ebd9339517f1a0ad31b4fb
font_01_sfnt_off00010cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC6 10068 bytes
SHA-256: 6d3adfbe7b1931029ad3f628d5173225d5ca59dcc8edd819a63be13fe8fc0048
font_02_sfnt_off0001230c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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