Malicious PDF — malware analysis report

Static analysis result for SHA-256 5140a6d1340bf4a9…

MALICIOUS

PDF

74.6 KB Created: 2021-10-03 15:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0696df3f629113aa67506812afc915d1 SHA-1: 8a0041b8137b26f2b88398005c92cb371715c12b SHA-256: 5140a6d1340bf4a916b710c76ad7dc1d43b1be2d7c37dfeb55c6e934cabba318
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. The presence of JavaScript suggests an attempt to execute code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.hro.ait.ac.th/js/ckfinder/userfiles/files/69090052475.pdf In PDF document text
    • http://ngor2-3.com/file_media/file_image/file/30243342354.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161321a0e8f460---jezexagaxakunusapur.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/fubimerikosuba.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/46036543885.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/ninunizaxezuremupugenipu.pdfIn PDF document text
    • https://proxkimya.com/resimler/files/demenoviju.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/13252271574.pdfIn PDF document text
    • http://sung1.com/upload/files/salugozuwexuwedune.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/sekadedategenod.pdfIn PDF document text
    • http://kco.su/userfiles/file/32395098726.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/jomajipoguzokuj.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a59bdce69b758767c121b2028a94f052/53898435889.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/botaz.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/fokabupegaxuwapajegukeni.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/tagokepasifukufarukoj.pdfIn PDF document text
    • https://scalping.ir/data/files/file/faxaz.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/sjnasio1s30q5pcker8jrg329n/sojigufixirajawulafir.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/zuvurizenulofekil.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/59913447699.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/33634f1567a478009764c83a45a41b8b/budamaf.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/vedipoforelamonixogit.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/5c264b64f8da5ca8fd6687a812bb9bd6/8847900596.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139bc6c7f7d6---36764239526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=vroom%27s+expectancy+theory+advantages+and+disadvantages+pdfPDF 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_off0000b9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD213 11308 bytes
SHA-256: f34cf47b44df52ee01ef19085e947a72e05b5bd4cb7cebf35f40c3c315b75cf9
font_02_sfnt_off0000ec62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC62 18888 bytes
SHA-256: ad8ca9ef2bf542368d003fe2bb0571eda9a426697d9dccf18b246b0fb09cb0cb