Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b741d699fa88cd…

MALICIOUS

PDF

80.1 KB Created: 2021-09-02 15:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 90e97640d300853052cb327635cc4443 SHA-1: 284bf93ee289fb67c1cc0dde19f41684f1c0753f SHA-256: c1b741d699fa88cd4cfa8e488ebb4ee389a8be96936500732f51b19649c5670c
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

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://aimhc.com/userfiles/file/26785884540.pdf In PDF document text
    • http://e-district.org/userfiles/file/97520673181.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/fa975619037dfebceec18ada875c5d61/nagipereji.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/21e580f3d3ea3b5c535814a2c0db3eb3/bebulitomeseralo.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/8f67f1da8e2e26bfd97929cd925d9a6c/76570297919.pdfIn PDF document text
    • https://dietacud.eu/upload/file/powakewon.pdfIn PDF document text
    • https://pilisilovaskert.hu/ckfinder/userfiles/files/zomalosekaxusibusigimivof.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/mugune.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/av2fsaip9t3u77solvtisjmsj0/rexoxafi.pdfIn PDF document text
    • https://jjpremiers.com/files/11540970771.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de7d8b7842---kitixupogedadumogebama.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/40528290664.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/buwivosadagofunefop.pdfIn PDF document text
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/47510579782.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/sj2hh4ode7ojf4afl1qoja86a1/zudemewuged.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3b1f02bdf---22028906368.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608061608996d---salokasetudex.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b57f8d1e6b---33884917739.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d28ec3f9bf---tinozefilok.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f30edd94a---1286757248.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/97483004195.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/sosexapatagesodepabubiwar.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/xagerobuguk.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/juvo31a137p7h4iovs5c502713/numonalilatirerinud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=kamienie+na+szaniec+test+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_off0000d59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59D 10564 bytes
SHA-256: 7e84c8fdd395f8f17dc0c0574752f473c54f9bea66ad4cd1c61443c6a2ac26c0
font_01_sfnt_off0000edb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB9 17804 bytes
SHA-256: c912a27a85565cab87d80968c791463bc69d7a3b607f457f3913a1dfb95d314c
font_02_sfnt_off00011a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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