Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fbf8f8f0d3d3f8e…

MALICIOUS

PDF

68.4 KB Created: 2021-09-03 07:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 11346afdfed43fde3d5b14185a33b822 SHA-1: a7894afe1f5c94d39a7df5e540bde381aa2da830 SHA-256: 1fbf8f8f0d3d3f8e4ef370e0fb6ea65b39364a22d557d152e844ea913e6653c2
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious due to its structure and embedded content, which strongly suggests a phishing or scam attempt. The presence of an embedded JavaScript stream and numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicates an attempt to redirect users to malicious sites. The document's small size and image-heavy nature further support its use as a lure to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://drafthe.ru/uplcv?utm_term=still+alice+novel+pdf PDF link annotation
    • https://noithathoaphat11.com/upload/files/xuduxibizuragedo.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/9075361727.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/wanivivirivekepofowa.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/fgrong8avdnhth3f6khf3p72dk/gatiwedifabunoj.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/5245616d6a57f07d84f821c1fc6bf2c6/makakifuxo.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/rawopijodevosavimifig.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa5e351d63---wejolovatode.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/4085164300.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/vapufemuxozimanonosu.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210702_175205.pdfIn PDF document text
    • http://kfbi.ru/content/file/43000940748.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/buvuluvu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608758811d3ae---52105947446.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160946b8aa74ba---salus.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/41767425638.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/bd12e8d16cc733fba0aed3d980db6627/lusogedaxakamutu.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/e94c9e02046abd6055733eba665a24ee/lirejukagapej.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/virureb.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c44dcd7165---98008722788.pdfIn PDF document text
    • http://ccsl.asia/files/32955378065.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/jijurenoxurekatiruzake.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/79476279213.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/j9759c3jlv4qnp9ggbsu2r2dr3/vawekokajomezogadaf.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_off0000b14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95F 13940 bytes
SHA-256: c1805dba58161805a8578bab83e2183e9e758ecd43424a2c4f0cc2168df6206f
font_02_sfnt_off0000ebe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE2 10484 bytes
SHA-256: 7b8c19c56ac1a21d10bae91e9a40ff834bbaeab44135c0fc13741955c3527f4f

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