Malicious PDF — malware analysis report

Static analysis result for SHA-256 6060b24a1ec094c9…

MALICIOUS

PDF

84.2 KB Created: 2021-09-17 02:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9aabb2fae39db89a5dd40ec4a4559516 SHA-1: cfd2a346728439618f1ecf86bed23c2f2fb20b99 SHA-256: 6060b24a1ec094c983a22b1d1d54d1280ef1aa82578e1d927b9473369baa8417
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of external URIs and link farms on disposable hosting further supports its role as a lure to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://cructi.ru/uplcv?utm_term=iron+man+3+apk+for+android
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/28164731015.pdf
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/jenovimewavin.pdf
    • https://viadagio.be/userfiles/file/33674793990.pdf
    • http://jhdljz.com/userfiles/file/1630494947.pdf
    • http://ballarioarchitetti.eu/userfiles/files/wutuwefepinojisilona.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/2daaa71a72afbac6a1d582190c46a76a/zotufogirazemuvita.pdf
    • https://signika.pl/Upload/file/48431648643.pdf
    • http://www.cerel.eu/images/wyswig_images/file/xufavawunok.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614006bccae15---58702282332.pdf
    • http://pjteam.hu/uploads/fadobutakelak.pdf
    • https://karpzbeldowa.pl/uploads/userfiles/files/29406179878.pdf
    • http://malabarisproducoes.com/arquivos/files/84044744561.pdf
    • http://gevenschoenen.nl/ckfinder/userfiles/files/94808264378.pdf
    • https://living-stone.lu/userfiles/files/bevovomufu.pdf
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/galuzaza.pdf
    • http://oecschool.com/userfiles/file/maxosikinozez.pdf
    • http://www.huntsvillepr.com/files/files/91961936983.pdf
    • https://www.agencesramos.com/ckfinder/userfiles/files/bevenopeda.pdf
    • http://tomdythai.com/userfiles/files/wuvig.pdf
    • https://fotokeramika.bg/userfiles/file/jorowuzobefolumizu.pdf
    • https://vietnam-pump.com/userfiles/file/20855716769.pdf
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/gugaxetese.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394c8a1654b---sogunojitopoz.pdf
    • https://gkia.org/kingkong/userfiles/files/76815882343.pdf
    • http://sm300159.agchost.com/userfiles/files/sewape.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f48a205570---2055988986.pdf
    • http://tageedesign.com/ssmpt/documents/file/xisok.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_off0000e4c2.bin
ed9e56b4aeffc44de31398fbd3228f958bc3bcad946d0b6e92bd299da98bcd74
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C2 17912 bytes
font_01_sfnt_off0001132c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1132C 16792 bytes
font_02_sfnt_off00012b43.bin
3891cb0d23ab22dc872d1b9930b4abba49b44501ad5b7f8aa757d74c4f2d8938
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B43 10432 bytes