Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1923c5ecb26ea0…

MALICIOUS

PDF

89.8 KB Created: 2021-09-12 08:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 25689b73da91ac8f9a24e697f1e3eedd SHA-1: 90d7170bd08edf98a54abb4d730a9bf2f8c8b15b SHA-256: 0a1923c5ecb26ea00593798e31c97a22007ea85d08b19810114a0d1d5409b400
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://dspec-car.com/js/upload/files/gerosejikumomi.pdf In PDF document text
    • http://balbu.eu/uploads/news/file/nonemalano.pdfIn PDF document text
    • https://proxus.nl/file/jikobikes.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad8f0078e6---xekenutaj.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/57097988129.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/55707787762.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/jixizonen.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/lanazu.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090623543373499.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/58406789866.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/xanike.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/99086863695.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/botazevilukosizoto.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/rifefakimotoxogepobew.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/20066947584.pdfIn PDF document text
    • http://qwerty.pl/_data/file/mifajogemopudexaloxezowi.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/wuxalepanaxedijifikumuli.pdfIn PDF document text
    • https://phukienbep.net/media/files/dupekobasisadubuvevamewe.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/38f49f40375d89c3a17dbe32510a2b1c/92643976275.pdfIn PDF document text
    • http://kasargod.net/uploads/file/58168484302.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac23c5f19c---77468098838.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6456845ab---fobexugojex.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/zefenuled.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/tijakajozojobupuvurux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=pou+infinite+moneyPDF link annotation
    • 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_off0000faa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B6 18712 bytes
SHA-256: 76035b9594463a9283b7585151ea1c814ed80b59c9f93eaf5191a65325e43066
font_02_sfnt_off00014348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14348 10116 bytes
SHA-256: 49264dcd712c26e9ea986c0c6b49e7767c95d1153e21fb885f7acda29ce44d26

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