Malicious PDF — malware analysis report

Static analysis result for SHA-256 188123fced3c7617…

MALICIOUS

PDF

73.2 KB Created: 2021-09-30 13:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 783f05d76e632319740eb7c6deb1d4f7 SHA-1: d87cbbfc8153efb47bde8dfce612d0b2ce596f1a SHA-256: 188123fced3c7617c50f5d8b81c6f9f06a4db1488188a5739fc00d1396562efc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://muabannhagiare.net/images/uploads/files/falitaxalawepijupovamog.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16153840500e6f---xikagevitilekiluzapajigog.pdf
    • http://holidayservicemarsala.it/userfiles/files/34129594892.pdf
    • http://teplolux72.ru/upload/file/67381827706.pdf
    • http://qianxish.com/ckfind_image/files/40656781561.pdf
    • http://archidaldegan.eu/userfiles/files/81852959894.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebc113793e---modugizad.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/588dd63dbce43b12d3e67443e115d50d/81017924866.pdf
    • http://officeharbor.com/pdtInfo/40414527858.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139eacc7c50d---refalib.pdf
    • http://tochuchoinghi.org/files/pevamuvuparapixopuwav.pdf
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/wizojemugeku.pdf
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/84391606622.pdf
    • http://af.ssla.ru/images/fornews/files/pedilusolodovulug.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/5546e50978a4f8aadde080759b341521/34141782394.pdf
    • http://gunjanjain.com/app/webroot/js/uploads/files/lotixosutofoluwu.pdf
    • https://truyenskyt.com/upload/ckeditor/files/13841473501.pdf
    • https://stpatswatertown.org/ckfinder/userfiles/files/vaxuvijarowalomoburilexi.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf474cd9b9---lexoxa.pdf
    • https://lrsinc.co/userfiles/file/65774294929.pdf
    • http://phonphangschool.com/upload/files/18355137720.pdf
    • https://ladangmimpi2.com/contents/files/sutiv.pdf
    • http://uptindia.com/newsimages/file///tatefa.pdf
    • https://gangwontaxi.com/FileData/ckfinder/files/20210924_A65EA04F1E7DD0F2.pdf
    • http://www.patriarca-batiment.com/ressource/site-image/files/tidebimadidasuferorera.pdf
    • http://tiwtactic.com/userfiles/files/vematuxet.pdf
    • http://ndt-tl.ru/upload/file/10261961868.pdf
    • https://szallas-karpatalja.net/upload/kanuginap.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=sony+ericsson+xperia+mini+price+in+sri+lanka
    • 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_off0000b751.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB751 16792 bytes
font_01_sfnt_off0000cf63.bin
7c71cdce4c9a1cfbd6152ce906f4fa4c55a7a8f955a814c53f703abd6ccdafea
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF63 18372 bytes
font_02_sfnt_off0000fe12.bin
675a96fb53987ffb81862f866e041b9d9e2d4339b9662e554c5e6a9d95ed89e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE12 10820 bytes