Malicious PDF — malware analysis report

Static analysis result for SHA-256 689953f267d377c9…

MALICIOUS

PDF

107.7 KB Created: 2021-08-08 09:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e2c036e84d3bb53a63ac321688d71e2 SHA-1: 00a92caebcfc70ff753708d150fe983c7c2d1f15 SHA-256: 689953f267d377c99157f89d426e15c08b0f071fa217db82ca43dc470ffd46da
96 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and is identified as a link farm, with many links pointing to PDFs hosted on various domains. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it leverages compromised CMS uploads and disposable hosting, suggesting an attempt to distribute or obscure malicious content. No scripts were extracted, but the structure points towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • 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://abwingstop.com/uploads/files/koxaxosigofimumivo.pdf In PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/98340069917.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/eq5ougq7p3phe43ij3n2crso9s/topetojuzerezovaboje.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/79382883670.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/6331928129f8768684179bd33d3edd79/gesedegirepagulaxexefelo.pdfIn PDF document text
    • http://adveotec.com/img/file/tavewetizawolak.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe04358e3---90079388100.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/48675599386.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cbbe069b234c21d0483f83c7daaf5c12/dixixurumike.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/a125iqe8brff54c3em96hrtnf7/gimolijisavodulewogodele.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/96d5cd4467ded13e2bd05cff6994d4b3/73498692810.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/290f8f9e4c82a278a932da29f141bbf7/negotirogebape.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e6276e729---bobewodikenaxezujabekexi.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/5268073775.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/1rmvvckpbh8jeqbkk6bho6bsao/vubetapitidifex.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/fomuloni.pdfIn PDF document text
    • http://abpaluso.com/upload/file/dibabuvigozefukazepuja.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/rosawipusi.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/he6s7q062i8rpfq07ucv8g8610/xuvumokizawudadojobi.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/pezanekulox.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b662288a7ae---84187624604.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2dce9ceb9---6956667357.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d565973239611f8ba2b8e39467ec8581/zudabasewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=parent+graphs+of+trig+functions+worksheet+answersPDF 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_off00014176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14176 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15988 17356 bytes
SHA-256: 4748b8e4f3dbdfef48e947ba569adee0dd2905e1dcad76f10278ab3384f2fe7f
font_02_sfnt_off00018752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18752 10992 bytes
SHA-256: b252a8ea1f79ee8bb280d9b095fa36cc1b9b9ac93fb879dcd33135b335dd8a85