Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe1d70492d0c680…

MALICIOUS

PDF

82.0 KB Created: 2021-09-23 20:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ce8968f900466a23dc99c29a6115e5f SHA-1: 63522c5706637779cffb02573d132ebefb196fd5 SHA-256: afe1d70492d0c68013c42b8d1b777ac86c3a45dd1631a9cffbc9b0313ca8a6d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript likely serves to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://studionegrelli.it/userfiles/files/92139143634.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/2915868928bb3ca12f0e78a6e3f0fb0d/61611237967.pdf
    • http://varadimasszazs.hu/uploads/files/11330364267.pdf
    • http://kimkhimientrung.com/uploads/image/files/girafijew.pdf
    • http://shinies.ru/img/lib/file/rojupum.pdf
    • http://azseal.net/uploads/userfiles/file/51705937539.pdf
    • http://cameradungphat.com/uploads/files/46998641597.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/47427995569.pdf
    • http://lpkgoodframeupvc.com/userfiles/files/91605122291.pdf
    • http://finchamauto.com/pics/poxerekixakasajaveg.pdf
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/bidanodezodabufinatopubox.pdf
    • http://longvu.vn/Images_upload/files/tapodopidewapegeva.pdf
    • https://pragatitic.org/ckfinder/userfiles/files/fizekoridatijataviduzi.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/qsvpoqhu2ojq1caegciq6tgqmt/78160841286.pdf
    • http://myphamlulanjina.com/upload/files/bovunawadejapubeku.pdf
    • http://avalon-essenzen.at/userfiles/file/89584240385.pdf
    • https://takarasushimn.com/userfiles/files/25603690191.pdf
    • http://thegioioto.store/upload/files/minajonomuluv.pdf
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/67264101776.pdf
    • http://korsorlampang.net/user_img/files/daxinatitixijakofe.pdf
    • http://cuoredicane.it/userfiles/files/tavitesaxirabetef.pdf
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/vipigiwadi.pdf
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/zuteburakarosavososiseg.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/493c6rrvbndau3up5scubac7m3/nogavedixuzug.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gold+coast+hash+house+harriers
    • 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_off0000d9b8.bin
f5f74b08d3f1e99f52936705bb75f9d2c3711d89252b9beed37442bcac8636e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B8 10500 bytes
font_01_sfnt_off0000f1c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C4 16792 bytes
font_02_sfnt_off000109d6.bin
39c589b0f028928bcbe25a8a10d83f0811dc4f5c85af844c491517bf5a3becb6
pdf-font-stream PDF embedded font (sfnt) at offset 0x109D6 18360 bytes