Malicious PDF — malware analysis report

Static analysis result for SHA-256 19cf835e27ecb2a9…

MALICIOUS

PDF

83.4 KB Created: 2021-09-03 19:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 643460c4a50b91560676b7f87cc58827 SHA-1: ea2ddb5cdbaee12818c8c156612170d90d1a7d84 SHA-256: 19cf835e27ecb2a96a5a0a0fc1103d7571a11f6f8cabfb5f241efd4df11d7f8d
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may instruct users to open a password-protected archive, a common tactic to bypass security filters. The ML classifier strongly indicates maliciousness, and the presence of JavaScript points to potential execution of malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • 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://scottleddy.net/clients/862555/File/wenaz.pdf
    • http://ordineveterinarivenezia.eu/userfiles/files/16326539388.pdf
    • https://istanajpdua.com/contents/files/63998457865.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/unvsqt6hi4bi5aok6o3gntlb33ffvco8/lumumijo.pdf
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/bogonopet.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/44d7718e881565601387ca29dbfa6973/78425329963.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bcc2b7f7e---lepuxavuxesosoj.pdf
    • http://ibconsulting.it/userfiles/files/vimuli.pdf
    • http://barcelonasixtytwo.com/userfiles/file/satuzanenibasarugalalotes.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9456a5a45---83753321927.pdf
    • http://www.parkwaytransplant.com/media_upload/upload/files/32972512320.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a589d7197f---4555562919.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/9457f6e57f463990a2fe271ab188affe/nepolenomaxona.pdf
    • https://ecodiagnost.com/ckfinder/userfiles/files/kebepabekafekumajanazox.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/46a90ca5bf214ad031199bd6fc41f696/26125611920.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/1dd6627b240cf34c02e0ca50d8456573/zebolanidexepexuxojil.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdaca58c45---45091947091.pdf
    • http://goldia.cz/data/file/16087300033.pdf
    • http://podushka.by/files/files/zukoboj.pdf
    • https://augsburger-dartliga.de/uploads/file/4475501903.pdf
    • http://debeleven.net/UserFiles/File/zozozobib.pdf
    • http://mhinflatable.com/upload/file/85673937372.pdf
    • https://drivetripper.com/userfiles2020/files/14485952508.pdf
    • http://bangkoksolarpower.com/syner_upload/images/files/rovawetidolus.pdf
    • http://technoauto.jp/js/upload/files/86494830392.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160813f052465a---76045522673.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=conversor+word+para+pdf+gratuito
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daa5.bin
e27464524bc1913930e85f9872663ec8e86a9e142e73bd76a664caa407e49947
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA5 20104 bytes
font_01_sfnt_off00010e69.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E69 16792 bytes
font_02_sfnt_off00012680.bin
1c1a57f64d48c3ddc35ba631d81cba072b262f84675eb7cbdba00abe7c86cef1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12680 10912 bytes