Malicious PDF — malware analysis report

Static analysis result for SHA-256 750ff066e8511e2a…

MALICIOUS

PDF

81.0 KB Created: 2021-09-20 19:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f25828a62810f0ff6d35e27f0a7268c1 SHA-1: 74a11bbae9dbdaa59c61b924ab5bfa3c5ede26e3 SHA-256: 750ff066e8511e2a1c01181de0d6541ac21ce5b8396e52b12a315617e998967d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links to external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be downloading and executing a second-stage payload, likely exploiting a vulnerability or luring the user into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://clinicaveterinariacittadivignola.com/userfiles/files/diraka.pdf In PDF document text
    • http://awarelaxcentrum.cz/user_files/file/92222595609.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/41151978567.pdfIn PDF document text
    • https://jck.ro/userfiles/file/pupofuleduwik.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/sujugipamapub.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/tetagiz.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/jiruzojuxepejebaridegugo.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/57066057182.pdfIn PDF document text
    • http://hanauhrova.cz/files/sapebakewosige.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/21101534734.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/moretobagudemarezavexebop.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/tukepogewerijakide.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16144157a0e946---vemarimaz.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/3123254807.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/72127756406.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/70142722800.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/rarutozamusotujujebuk.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/tetulixig.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/bce1a73e6d7fd07594b437cf4196a20c/tuvakunevepiriketi.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/kozojatufagokaw.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/gitezopo.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/7180251096.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/51a87221599e9f047aadbe5d54c4a171/58596830148.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/xoxafuduzodupubirive.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467ecad817e---93194486942.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/64948872155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=7+letter+words+starting+with+guPDF 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_off0000d6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF0 10664 bytes
SHA-256: eca1e45cfc4e0bf189a4efb85368623e1488e435cc9c39ae6db043cd1bebb1e0
font_02_sfnt_off0001072b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072B 18184 bytes
SHA-256: 0ad3e92c15960ba483a0f49aee089a8b2a02b74000144a570b2bc6a4c96b6fa8

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