Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23fbeec308b4405…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 20:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0ab32f8dfa6f930bc8e9fe4ae934db80 SHA-1: eb2447f6df17ce473111ce0587ea79ae4517b972 SHA-256: b23fbeec308b44057bd000e074beba5ffd2061f8902c4e79f250841c1984fb92
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. These links form a link farm, likely intended to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=essentials+of+nuclear+medicine+imaging+6th+edition+pdf+free+download PDF link annotation
    • https://bankkartya.hu/js/ckfinder/userfiles/files/pigokox.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/5e9d3ef2c0c6901553d7ddb9683cf578/nodon.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161217ec64986d---zigezewizerekuzerukud.pdfIn PDF document text
    • https://kimcert.net/E/file/78346104897.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/tidamaxenutelomel.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/zujeg.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ihs5ra22vtm2gspps5pub6ht68/77838944465.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/41596508049.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/wesirob.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/94563387125.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/51cd0acd427964f0d83f84560402884e/44422241617.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/7263344533.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d9903f5db5a05b1fa1a4798ab773a2e/garofox.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/57911173779.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/58961381694.pdfIn PDF document text
    • http://gapp.fr/medias/files/revesadezomofesukupimi.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/e4f76d7bada369d558e7074e2d8a8161/mukagogenagunivogifiti.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/kekirukuvisipefil.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021082901594731.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160736f1e85f14---wixapifevapa.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/pidufifavuxubulewibej.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b745388923---kugelalu.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_off0000d9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E8 17856 bytes
SHA-256: 5fcb5ad9c2393410d344407dad86722992b3409627f49f13fc41198683411ace
font_01_sfnt_off0001086c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086C 11404 bytes
SHA-256: 7d784b89e6b85acebd09d4ae38e5e4d199b6e9a4921dec88fd1142174a7c7918
font_02_sfnt_off00012302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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