Malicious PDF — malware analysis report

Static analysis result for SHA-256 507d53a5b12d0287…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 00:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 660b3a259e9e86194a3be6800d270a08 SHA-1: 250496436078161f617c6b7699b9a3551e278a4a SHA-256: 507d53a5b12d028754bdcaca8baefb1242f5d31b0371f5aec703fb98aab4b388
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads or disposable hosting. This indicates the document is likely part of a phishing or spam campaign designed to redirect users to malicious websites. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://chcial.ru/uplcv?utm_term=test+estilos+de+aprendizaje+visual+auditivo+y+kinestesico+pdf PDF link annotation
    • https://tepihtrava.rs//files/diwawukip.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/gezisobexupijebe.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9b7175fb2---wuguwazowite.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/hbodnomr9cl3a0813geavrudh9/70135712878.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/sikizawefolamirutubaviwuz.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/derusazanewule.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/81777064855.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdea8998fc---82324708461.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/15933800515.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/46c41f5801c6a13d4de89106436c2237/74941475529.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160909dd722c79---10140242989.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/12482111585.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3b969d22f---50178202653.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160849bb49a5a3---45504101982.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/7959309477.pdfIn PDF document text
    • http://chromavials.com/d/files/jegibo.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/33631722610.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/govavidinafefilupibodukan.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4948022618---kozusujetakijom.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160fb802891ea6---vibefefafuru.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/rcr1e5sdtrooteb57n3a13llip/5150050794.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/kafosegosatexixesevijexa.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC60 17532 bytes
SHA-256: 4959fd1a147b895c4608e5b6c2871062ffc0e9f28c912caa310c08f9744e3708
font_01_sfnt_off00010867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10867 11140 bytes
SHA-256: 7808e4cde885eb2d2b3a3a0a0b8485a20ce901c6f7fd21204225c068fc285e11
font_02_sfnt_off0001229c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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