Malicious PDF — malware analysis report

Static analysis result for SHA-256 353873bb512d0621…

MALICIOUS

PDF

86.5 KB Created: 2021-09-02 07:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d0f578ab7c84d246de2c8000b6483c38 SHA-1: 449e17595ccf5a6258592ff70c49103225cd980f SHA-256: 353873bb512d0621f220670e28dabf71818e35f4565f2c31eddcd564ee76c85e
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious, and the heuristic findings suggest it functions as a link farm, likely to distribute further malware or phish for information. The embedded JavaScript is a common method for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://huntic.ru/uplcv?utm_term=jousting+at+windmills PDF link annotation
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/18724605988.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-8/file/rimegusal.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/32600238627.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df8c44444a6---midojo.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///dukasadavipewenetes.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/muradinat.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/57579778169.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16085c4ddad4ad---zolimolubomozunupu.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/pazesidatazowumalupila.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/44099617057.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/76512657744.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/65aaa4b4ba3934165dbeb76084acfbfb/dozugevo.pdfIn PDF document text
    • http://ttc-investco.com/img/files/51126798426.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/kotuziwedagudofalifevewem.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c7e968327b0f9dfe2924e502e7a13467/jopilejuxe.pdfIn PDF document text
    • http://esistore.be/userfiles/file/59878626021.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/6n9p0r50kk6j171shjjdb5ef6b/modemojipodewos.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077a96916aeb---81532531360.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/36149225553.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/5c7ad225d3993d52a0dc4dbeaacbe64e/52566226359.pdfIn PDF document text
    • http://rowsontw.com/shopadmin/upload/files/nanateg.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc80a097ad---55991555779.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/ximiriwago.pdfIn PDF document text
    • https://palet-school.com/files/files/fumotodulixegowotodikel.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_off0000e9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F0 18844 bytes
SHA-256: 28488564da8f4132f0d910b57a67e77d24b9be8c6d2d944c3729aabac29d959e
font_02_sfnt_off000132d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D0 10536 bytes
SHA-256: 548abf096b92b85fdf4bb86cd99645538d871cfb2f3382169dba33cf03865730

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