Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eac092d38ab7904…

MALICIOUS

PDF

89.2 KB Created: 2021-09-12 07:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f887bf4efd93ef348a0476f6255be4a7 SHA-1: aef4ef687eb0f051d34d855146883f3e6cc4fdfd SHA-256: 1eac092d38ab7904232514daab3a4bab503e279845969a9f8f4f529a35167357
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier strongly indicates maliciousness, and the heuristic firings point to a link farm strategy. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://snapstudios.ca/userfiles/file/puwizotisetobijiverinopu.pdf In PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/tomijak.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/34399879172.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/53874324964.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/pulefenorosobirojo.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/8bbcfb0c26fecbdc558fda8f61a93950/disaxawon.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/jopiwitug.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/87997518789.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/dijuzibiwupefirizeweseg.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/43141980815.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/komujuwomedomagajosuk.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/satakediropofizuxojadizon.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388b7ae15f8---pureradabema.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/cdf7ae97b76e15fbfa0861cd3fe838b4/16535926903.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/suvupemebifipik.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613414cbed0bb---69274843946.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/74132753584.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138278d3faf5---xawibutazos.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/39294331291.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/vejuxobuwediwiwirawu.pdfIn PDF document text
    • http://mfahk.com/upload/files/46798591761.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/joxuvibakivudejesawobur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=no+other+woman+full+movie+free+watchPDF 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_off0000f9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BB 17596 bytes
SHA-256: 7c36693eb696a7cb462c4883f669879eb595938c2852dc3b795fb853e6bb678a
font_02_sfnt_off00013ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE9 10664 bytes
SHA-256: f897daa38622a30ac3a9906c5e03b2935cd8dd18ac7f921738374d750c02d394

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