Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9abf62ac84582f7…

MALICIOUS

PDF

78.0 KB Created: 2021-09-15 12:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 307f938bc07fed90f794bf9caaca20e6 SHA-1: 38547f0beb4bed6977812cf6421ef69f26765800 SHA-256: b9abf62ac84582f7f8ee6b900140337d8f2984eeb77347f45cf42e9a694463c1
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's designed to point users towards potentially harmful external content, likely as part of a phishing or SEO manipulation campaign. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

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://baaningdoi.com/file_media/file_image/file/40409851768.pdf In PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210910125747.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/63839803565.pdfIn PDF document text
    • http://fgosvo.ru/files/files/80477272149.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/93e98849361bb071d54dbd9809ce6bc4/sewinim.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/23200841287.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d31c5f3118---39241393003.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/jewekosetuxu.pdfIn PDF document text
    • https://keongracun.org/contents/files/wurekej.pdfIn PDF document text
    • https://duel.pl/userfiles/file/10889800282.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/dnq6a09e255klvqh7aomf476oq/614469420.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210909193724_148584142.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/16c612c3d8cdb4caed9521e35c3f4308/ridinibozipiwiva.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/27434264479.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/fizunudowavimufuluvejubi.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/besanon.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/73977082945.pdfIn PDF document text
    • http://terrietanaka.com/library/files/bogefavevasagurugujiwu.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/ladogin.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/9100974033.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/vevatutaweligiwuxutusere.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/duluzegumosokifep.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/54599599409.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/41437476598.pdfIn PDF document text
    • https://mkontakt.com/dat/file/6701753182.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=siege+world+war+2+apk+modPDF 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_off0000cb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5C 10740 bytes
SHA-256: 932ef6426c937faf16a218245947c74b6120caec2911c9b308bbb97953a3431d
font_01_sfnt_off0000e3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EE 17872 bytes
SHA-256: 9426fa84e518a20551db4ce071951eaf895eb4d5d0ee3070a57f561e214e8bff
font_02_sfnt_off000111fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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