Malicious PDF — malware analysis report

Static analysis result for SHA-256 494dc754c885c838…

MALICIOUS

PDF

82.8 KB Created: 2021-09-03 09:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: f69755a868550288230499636f655997 SHA-1: a11d9c6ee8d3ea754262dd82e7e44eb8b516611c SHA-256: 494dc754c885c8381799595bd2943abad8dc9859d06bb585e5d7c094d1f5f9a3
104 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9974

Heuristics 6

  • 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://laborke.ru/uplcv?utm_term=revised+mastermind+use+of+english+teacher%27s+book+pdf PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d29305cde---sobexo.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/daxuwekazurimudeku.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/gexejowabuzixipewonogodil.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/24700061719.pdfIn PDF document text
    • https://miruyuta96.ru/admin/ckfinder/userfiles/files/mexute.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021070510301685.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/29382081964.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/zalevabudogubabigox.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/jomoxibodupeneko.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b63951ab6ca---mepogun.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/f35834b0678799d3c44b0e2137f340c6/16809082243.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/gebojibabufapidaxetasi.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/lewakizen.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa537ae336---dafelireb.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/metovajejibukagij.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/jigumo.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16091e6a551456---52845323375.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/57758277446.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123cdacce634---31625009158.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pofamekake.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/bcf51365108a071c646e850ea58b3f50/fitunobuwigifu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/sukunenaketepulajigoximov.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/nomafugorigogubufexixa.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7a66880da---17536772858.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_off0000db3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3C 11544 bytes
SHA-256: 31458e2e2c3ca2e489f3f920e13d89b48c5c9533126c191a4a0074d46d1f219d
font_01_sfnt_off0000f610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 17736 bytes
SHA-256: 3e842cbc54f1d842716551819cd9fd27bb679e55a7c5c7f322077f877d3e058c
font_02_sfnt_off000124d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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