Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ad4bf7657262c9…

MALICIOUS

PDF

71.5 KB Created: 2021-09-26 18:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7f5ceb57dffc0e5746fe5a01c6fe4524 SHA-1: 8ee4c726313529ac881d319a14497c1b2cc9a20a SHA-256: 58ad4bf7657262c9e40c891d43fac153981ee828c4d8d9dbd2fc57298434cd26
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, indicating a potential for malicious execution. It also features a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malware or engage in phishing. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=master+for+mcpe+mod PDF link annotation
    • https://tailormade-sales-marketing.com/userfiles/file/mebaxelefixir.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/zawujiki.pdfIn PDF document text
    • http://gptools.net/userfiles/file/80269288781.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/95b3014b78ed7f05f288389ab92faa4d/87450278265.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/xarilufibitagosamewuwup.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/wigobefodivagoxurikub.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/ppul0aijong89o2umer9gckld7/fawovetututi.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/kusik.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/73f788ca91106907d4205b5944a1137d/19975606289.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/23070858273.pdfIn PDF document text
    • https://sergiomauri.com/images/file/60900106136.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/80795078381.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210916090637.pdfIn PDF document text
    • http://opsir.eu/files/file/wopadugosedudusozafidit.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/fodorugekatumidajalobisad.pdfIn PDF document text
    • http://atem.sciara.eu/public/upload/file/79500189633.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/51ed121980dadd0c81ef305268f4ad05/wazagetoge.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/bevazemugozirira.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/14459409888.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/juzinefaradejexomubul.pdfIn PDF document text
    • http://demkapi.com/resimler/files/53241119998.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/83690395942.pdfIn PDF document text
    • http://vladekoservis.ru/files/fuwerajovolojevusakigegul.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1e7b80fe9ce52d95ceb1598fb770d8e/ronoxi.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_off0000b52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52F 10532 bytes
SHA-256: e3d211cbff4471bbcba2921fa715dd21e8edb910f80d3ce41a6849b7784d523d
font_01_sfnt_off0000cd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE554 17000 bytes
SHA-256: a9f1fd237d8275761c914d10329618d220c9c7c434c84dcad28900756f0c9773