Malicious PDF — malware analysis report

Static analysis result for SHA-256 260acf5efb30b79d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-03 17:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6660b7ecd5e9df3949d10bf948649a56 SHA-1: 73fc20199f0eb827709e3c86152735a3d9bbb93d SHA-256: 260acf5efb30b79d9f424498104bb4e71e8dbcf9aeecedfc72b08d5577e18b97
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://parkhighclassof60.com/clients/871169/File/selebezowexag.pdf In PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/cda7ffd1d7c303975771865e962b976e/bovuvaxevegetukomoj.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/64012268634.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/galuwiropawefereguku.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/kls5phf0k87o5mojo81l01snd7/13030094005.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16077497e7b145---mojonelonusasekoruxipewux.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/nonej.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743b9450a4f---zopidowezedonodekut.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/komapadaz.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/7823239451.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161031c8b7dea8---52790893416.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/h4l9dimo5ffotqrpjvv5ef0pm6/gawajarikikogedutepa.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e6efc5da4---zasux.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/bejagutafili.pdfIn PDF document text
    • http://iltorg.ru/upload/file/96567461380.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/069f5f02c12ec398fd0c6ce394521a83/98782281586.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/kinenabagasenekok.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/5kq1747lefqm2qt3ogl9i5otc9/78201852809.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/87534186091.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/98f3f58f5cb60a0f42bc277f89ef27b3/jadisofupiwexavakewerix.pdfIn PDF document text
    • http://greenld.com/userfiles/puxufebufoxurepidido.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/74891221671.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/nixakuduzobanobijuvidized.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=fpdf+multi+cell+paddingPDF 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_off0000d4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 18428 bytes
SHA-256: da2b1cc177642f2d2cce9231da231a3ce779b034e913549f13e3d0a755806867
font_02_sfnt_off00011d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7E 10652 bytes
SHA-256: 78a131f296baf18bcf20cb6a59d35e2770fc6616bcfd1782ba9205c0373f2b09

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