Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0845e0aef1dbe4f…

MALICIOUS

PDF

104.6 KB Created: 2021-07-13 06:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ec3ef8ea4f9534416913a469141f269 SHA-1: 8d0c9daf1aea89b716f08ee8c5f28b6c3058fca5 SHA-256: f0845e0aef1dbe4f83637a3ca73ee143fa6d81b69ec3a076083ca133d21d8c31
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is unreadable, but the presence of numerous URLs suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://bancodevida.com/bancodevida/admin/images/image/file/tadukabojetapokiwoxibebu.pdf
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/72556046522.pdf
    • http://bulk-supplies.com/userfiles/file/48381555993.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59dc93d35---33227088380.pdf
    • http://cathugo.de/res/wysiwyg/file/jituz.pdf
    • https://oddluzanie.net/userfiles/file/50273802661.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c48867b7eb7---xetovuvidojiwuwiwudo.pdf
    • https://jxloanchien.com/style/postimage/file/ruzakibosoxewetutixoto.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/84e77e1e6bea57e8e9608106cf104e6c/93022606463.pdf
    • http://tvkinter.com/file_media/file_image/file/relitesuwa.pdf
    • http://www.allatpatikapecs.hu/images/file/86823969584.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf5abdc492---bepivijiwaradan.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089084580ef4---87755867414.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/torotafotamukuwow.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/4534b750f19eddc72f39b35a95b4c714/felet.pdf
    • https://samavetpharm.com/userfiles/files/rorisegawubuzap.pdf
    • http://edwardlankin.com/clients/86087/File/34385498393.pdf
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/sexibogixudivukofopa.pdf
    • http://amuseonline.com/absite/userfiles/file/wilolinobizir.pdf
    • http://hopkinshigh1988.com/clients/75739/File/jasatuxonodusex.pdf
    • http://ibiforstarlight.ca/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/senelizemegovenipa.pdf
    • http://perfekttorun.pl/pliki/marukibolevakorip.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb389cf2a1---vimovor.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=classification+of+gasifier
    • 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_off000133cb.bin
d8fdf774b6bdc4be6f9ff836a5f54eb5cd846651389367d9e80d6fa97ed53db2
pdf-font-stream PDF embedded font (sfnt) at offset 0x133CB 10540 bytes
font_01_sfnt_off00014bf9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF9 16792 bytes
font_02_sfnt_off0001640b.bin
ab54ed6f6d3f8c8a5a38b55effb58a1a86ec218805b983804b822fab0482df13
pdf-font-stream PDF embedded font (sfnt) at offset 0x1640B 19096 bytes