Malicious PDF — malware analysis report

Static analysis result for SHA-256 9790612753112e05…

MALICIOUS

PDF

83.7 KB Created: 2021-09-17 12:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 72f031c20c1900e85f5e89be93edfcc8 SHA-1: 17dd2e23716dac3f5ff0b5d65acd70f6307a5c88 SHA-256: 9790612753112e0533f07cffa0c815204f4c6fd6b6f4696741cc10560b7a54b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. 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 initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://nomylo.ru/uplcv?utm_term=temple+run+2+lost+jungle+in+real+life PDF link annotation
    • https://olgunbey.com/upload/ckfinder/files/46591706448.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/30744436835.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/46886338819.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/16353917395.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/87090766171.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/35633408879.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/13559593438.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/luwozamisodegavode.pdfIn PDF document text
    • https://emmaushuis.org/pages/98717117545.pdfIn PDF document text
    • http://apart1day.ru/file/68285562856.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/89020412363.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/263fb20f112050cb3a66992e0d6d4938/48958991926.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/17538953313.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/72336747617.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/92953136320.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/avdudqg3709h98fclo1bgcqee5/52089285106.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/wesine.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16143f8b01f092---lisudenu.pdfIn PDF document text
    • http://stylekd.ru/files/63655404410.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/1n68g34b0gg7qn1krbl4771dfi/96766366972.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/bepesofejikoravaruju.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613361e09a72c---34890012660.pdfIn PDF document text
    • http://runhouchem.com/upload/files/24252660676.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139e23adf0---53117954506.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/13671862835.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/gofopofumumeb.pdfIn PDF document text
    • 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_off0000e239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE239 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 17192 bytes
SHA-256: b85b849dc39e7e2cb8dd3cd8c06ac098d0b0757c2c1e73dc8a6de80d9536eeb9
font_02_sfnt_off000126c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C5 11012 bytes
SHA-256: 51246a3839a4272b955c5c3f59c5da32c8ae345d9497bea915bf1f454709c1f2