Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac6d90c51d7b380…

MALICIOUS

PDF

77.0 KB Created: 2021-06-25 22:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cbe4fe3fdd6f34fd4c6deacdc06c78e2 SHA-1: 25c17df171d2fb97f098787b30247fe141f32741 SHA-256: 8ac6d90c51d7b380bf8f6c6b88c0d2f16781251a18a17705c0d898293b7acf66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://autopratichesas.it/file/82138927298.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/22432161843.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0adf6de2ce.pdf
    • http://ballstonfamilymedicine.com/clients/861402/File/44264602986.pdf
    • https://sambelteri.com/contents//files/gifilukodazilogiw.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3e932238c---32196029797.pdf
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/60847478161.pdf
    • http://www.niziointerior.pl/upload/file/redodamuxumof.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b46db65b1ae---17929274656.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/70821820403.pdf
    • https://festival.bg/fckeditorfiles/file/xezofenojimonorawasutameb.pdf
    • http://petukmahaaaraj.com/userfiles/file/pezavuvagijanajaletif.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d75f8e5df---jodawogexadalodena.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021510111469275.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/15ccb7b6cb7fa0bccceab6daad9801d9/84939059601.pdf
    • http://artospace.com/pics/file/78306584180.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5013c3937---12389035860.pdf
    • http://jfhcoaching.nl/userfiles/files/28880625357.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/82asttrojfi9k1h8eau9ep8or6/25598272666.pdf
    • http://minutemen-jrotc.com/clients/84940/File/lesan.pdf
    • http://atsrealtyvietnam.com/upload/files/fulojesumoxi.pdf
    • https://armagedonspedycja.pl/files/file/xinatu.pdf
    • https://ckmusicdesign.nluserfiles/file/bozizulugosefiwo.pdf
    • http://midel.me/userfiles/file/kezotolijekaxikako.pdf
    • http://www.vikingmaterials.com/img/bewovogemu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=an+irrational+no+between+5+and+6
    • 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_off0000c753.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC753 16792 bytes
font_01_sfnt_off0000df65.bin
4dd69422d823158d12206522f2796176d472427d9ef2a7530340397b421c5ffe
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF65 17736 bytes
font_02_sfnt_off00010e38.bin
d15f32edf1ae65c2c5b293ac655a235f3da1f5535d68808bccc23e58f8c31062
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E38 10584 bytes