Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df24f545043e949…

MALICIOUS

PDF

74.9 KB Created: 2021-09-20 09:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b1a2be28b59025477aa75b0fcd2ea2a SHA-1: ac98fd8e1bb8e09ff26ecf0127674b59966ae444 SHA-256: 8df24f545043e949198d8098a2cc90cfb8d9a4005069a85107bf3424ff3f4718
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF also contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, supporting the assessment of a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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://euskararenginkana.eus/files/galeria/files/netefusif.pdf In PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/83680669580.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/80174454105.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/liruvubako.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/qv0h8k4nbu9rnp2499kd91frb4/jedigujogu.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/gokefigozejinuzibegevo.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6151428451.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/wexilovowuxizevos.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/wojataluzegage.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/32a83dd3f29b38583a1fe869f3145b1d/jofojopezojugitofarewasaz.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/bugukozukinudige.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16142a561da64b---faregajarenaxubowefisil.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021091208002725.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614045f0f131c---nasix.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/lukerasolafofufuva.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/1471700955.pdfIn PDF document text
    • https://businesslife.com/content/file/51700135106.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210906050606105.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/12b641feec2617cb7af8a2e9603c1299/tisitotafetigatofilu.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/ralusizero.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/57811379450.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/41670309678.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/85247570572.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/30349185136.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/mapomerenenazoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=best+apps+android+2021PDF 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_off0000c1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EE 16728 bytes
SHA-256: 77285c24fd6e5110f85d8d6f4064c9e06df3f1ba09216c008606e1db2ed8bdfa
font_02_sfnt_off00010546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10546 10688 bytes
SHA-256: 1aae7beb9fe0af0ce87fb7b010ab6cb564cd0058d9905fdc54a1f5059728326d

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