Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6857d0c3c83657a…

MALICIOUS

PDF

70.4 KB Created: 2021-09-29 10:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3953a286bd5e61e72525a74b111956c6 SHA-1: 32332f19653bd02b796cef45a0b09c26e9c751d6 SHA-256: a6857d0c3c83657a8bde1b795dcb4ab2fe93f2cc23ddc74a6292ac34d0c64625
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) suggests the document is designed to execute code upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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.
  • 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://queure.ru/uplcv?utm_term=what+can+you+make+with+the+elements+in+minecraft PDF link annotation
    • https://clove7.com/userfiles/file/ninipa.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/7877488366.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/buruzesudotodes.pdfIn PDF document text
    • http://thepducphat.com/upload/files/90110129232.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/87931689696.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/kugevubemis.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/kizotuvaxemu.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jitevatafutere.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/welogis.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/64527645369.pdfIn PDF document text
    • http://armanetti.com/images/84090534623.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135f9a893efc---79863165601.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613079ef309d3---45426494615.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/23865251718.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/78791621943.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/nupujon.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/63467815817.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/60101801128.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/69270290534.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/8257394540.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/magupimaves.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1614533cb6ee59---jokitudofinabelami.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/39276111534.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/jevijutatunaxonezobiwi.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/76175021647.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/54411086308.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_off0000b1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F5 15860 bytes
SHA-256: 33e89914ad592417c050d984e5cd5c0351b176ca2867f8eb4a5e0e46d5c901e2
font_01_sfnt_off0000da14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA14 10988 bytes
SHA-256: 2bb310b40a0a745f533b331314281b10849466d41a4f0bc6c3d6df854e0f7f18
font_02_sfnt_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1