Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1de9c1e104785a2…

MALICIOUS

PDF

83.2 KB Created: 2021-09-21 03:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cd20c2cb170bb22085f1a8c895be263b SHA-1: 0acb6c4272eda4fe6e01ca2d4a28f63e692edd6b SHA-256: b1de9c1e104785a2f5c623243508f914c2387ef46d46f1769d9b98ec77715b94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, including a link farm on disposable hosting and links pointing to compromised WordPress upload storage, suggesting it's used for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristics indicate a likely intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=attack+on+titan+assault+mod+apk PDF link annotation
    • http://aerotechgroup.ru/img/outer/files/dexopi.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/83171786610.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f8141c05c---64401124148.pdfIn PDF document text
    • http://dienhoabacninh.vn/webroot/img/files/27026958655.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/39452248814.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/1532828400.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/71106056751.pdfIn PDF document text
    • http://le383.com/uploads/files/81712524259.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/92983604621.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161392c86f0166---97875581987.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/tiloxefasagawusek.pdfIn PDF document text
    • https://sergiomauri.com/images/file/jukevija.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/bikugokotanakamifob.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///poserapepixanenogabeloso.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/66211476866.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/78021643752.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/jomel.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/faranagev.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/dupagupanilemu.pdfIn PDF document text
    • https://alohasafaris.com/files/kebazevadewujozos.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/77823096091.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/zutopamibatejuvotifufo.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/rumojiv.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/rososaketejavajom.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138334c25394---misokikizezeloposekifirez.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_off0000df8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8E 10616 bytes
SHA-256: 5dd0b77429042398da7763ad8b6b9fe4c41878e4ceb3fd62cec052909bef2092
font_01_sfnt_off0000f7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 18312 bytes
SHA-256: d7f1fd0ba00470845b379cfcc1a797aa576dc9ca704b12e67de731254b9d7d15
font_02_sfnt_off0001274b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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