Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6bb2416ff1ab32…

MALICIOUS

PDF

73.2 KB Created: 2021-09-20 10:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20085e86ba4d6c393950f6d0961e270b SHA-1: c18f1a945959ce7e9e7b2dc4855ffef0e4a8382d SHA-256: 1a6bb2416ff1ab32adff47b9666e8abc29f73012ee6417e1343f482df213bbf5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous links pointing to compromised websites, suggesting an attempt to deliver a malicious payload. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a deliberate effort to host malicious files on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://garglob.ru/uplcv?utm_term=iphone+6s+plus+manual+pdf
    • http://joeun-it.com/userData/board/file/sojolibonipatefofube.pdf
    • http://cuatro-pr.org/sites/default/files/file/20157133591.pdf
    • http://porpora.info/imagenes/imagenes_contenidos///89042965197.pdf
    • http://www.bc-arman.kz/ckfinder/userfiles/files/1849626700.pdf
    • https://bunianco.com/other_files/File/dunimekonosonurufesumo.pdf
    • https://marcuspietrek.de/MARCUS/files/file/nopuxapobirilolij.pdf
    • http://matsusushionline.com/uploads/files/vuzezogemitomofonufewabe.pdf
    • http://zbirozskepodzamci.cz/userfiles/zafutivakidi.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161405ef8a784c---nabikujifunorun.pdf
    • http://daisin1977.com/js/upload/files/jigulalo.pdf
    • http://siamsnail.com/media/userfiles/files/23227838461.pdf
    • http://tunglamgarden.com/images/fck/file/58264428905.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/14331118.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613478dc62b13---sopen.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b640676a10---67782648521.pdf
    • http://www.truca-taoules.com/ckfinder/userfiles/files/fojulafevazuzidolufisuseg.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/6ad32d9f0a331ab6529684170c7e586d/gixepepexopajikiget.pdf
    • http://ekvatorbl.com/userfiles/file/wosigunizezotuzikoxuwogig.pdf
    • http://oxigensupplies.com/shipinc/userfiles/files/18246253402.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/55577f5dfa64df36b2f6734675b76689/33468415260.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144cfa7b88fd---31672455273.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6da6c217024b744310a68a2daf0c929b/78217532191.pdf
    • 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_off0000bf31.bin
1357ecb13fb1960fb7922b33cc0d71f61e9036237a7a40888530fd3df9f46a8f
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF31 15500 bytes
font_01_sfnt_off0000e6ec.bin
4d76bd6a1c4076c6601aefc6cd835cc8cb8212d15f1850db464c6bbfb7a27843
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EC 10692 bytes
font_02_sfnt_off0000ff46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF46 16792 bytes