Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61110b8d20f9bba…

MALICIOUS

PDF

91.4 KB Created: 2021-07-15 16:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f7a3f47b5735c8e0c24ccea8ce4a0347 SHA-1: 533ea50164408d586a339773e772a09a3ce8962b SHA-256: a61110b8d20f9bba01c573a5816b9234e55a55e5730c607ab41793092530594e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/3de8cf30840d6e6ed2b82451dfdb23b7/73707358707.pdf In PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/f4mgtm5rvk65af5g2va8lsfh3a/24162167511.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b2d3178db---famipebujekalep.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/12310791080.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/18cdb51e93efcd59235ff6f8d5afb928/jovuxuxarelenetezozosuz.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728013d9c5e---97641313675.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/94417681448.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/90140911331.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/0dac1794f052f360f9bbb0c5a2993088/43633427208.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/15939950897.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ec533ab35cd---xikerilodugavutix.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a14006baa23---94149333083.pdfIn PDF document text
    • http://contelex.it/userfiles/files/xotuxekinenilopezusasasa.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768dcb134f6---wubinibividapakujuzetume.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/9c340a912376706a3aeeeac1dab39bdc/burenulajumotab.pdfIn PDF document text
    • https://wita.lt/images/files/1192092725.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/rudutolerewulo.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/b4ed7f97389cf9a4f002481fe2fe80d6/98109282390.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/36651887193.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c649003d689---juvodinogawawaxiluz.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/22760980546.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/4fa0f98da244846808b4e7c8dab93028/vamemalipemi.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074d093a36a5---ruxitagapaw.pdfIn PDF document text
    • https://kawanmto.org/contents//files/rakulelozozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=cremated+and+turned+into+a+treePDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10658 16828 bytes
SHA-256: f1846db7bdaec4c2b59817b363da8b19ab8ab84067c889fa889ffb7080c8a88f
font_02_sfnt_off0001324e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324E 10324 bytes
SHA-256: 154bf29ad19a7fe18bc1d6a0126671d42862c80eda12842a0696d86292f5a692
font_03_sfnt_off00014990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14990 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae