Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc30ff363690b2a7…

MALICIOUS

PDF

76.5 KB Created: 2021-09-08 05:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 71f515e5773a4df798e6ece425b6d925 SHA-1: 9ac0375ea8c17cbec162d930b72dfe2815f053dd SHA-256: fc30ff363690b2a7e0a3b3cb61128d5f05a592b45259a7b1bde77ddb2aa76eb2
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of external and SEO-optimized disposable links. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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=cuales+son+los+macronutrientes+y+micronutrientes+pdf PDF link annotation
    • https://uppersanduskyrotary.com/cms/files/File/vukomejitigofa.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612177f46648a---jipasegigegubelun.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/73570435528.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076734801691---jomax.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/jijubokotikogugijawap.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/72958107510.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1092e91bf---tobejewusur.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/39900572048.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/38ee0c36afbed0906edfec1daf1c8afa/ritotudonuxa.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/79863310436.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/ea2ef780d6720deb0be050d74350341e/29249126092.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/2gg9845hpf44vmscvim9qsi68v/danexifipumibunukafeka.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/36226380337.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16099032052f11---75021479191.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/numowijoferetaza.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/6agrop8ohfpiuv58kkrdbn83fo/pubibekex.pdfIn PDF document text
    • http://polkovnik.su/upload/file/91312236670.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/pomizeg.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/38116121323.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/vutapuferixepek.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607470b0ddeda---91477422734.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/mafoxefanometoxawu.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/nnafa1j1eplof5j0ktm637v1r6/90740462289.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/cb81b68b1b111c9273db58a7c9d9e94b/23159175248.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606fd6db3ce07---88420104399.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_off0000c762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC762 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF79 11024 bytes
SHA-256: 65f4b90ff3ba2af08b31ca6262d6443b1d8bca125ab647426dcb092330428a8e
font_02_sfnt_off0000f91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91A 17008 bytes
SHA-256: 56496016479eced01c673570bb266c8a667eecf6fea8456ffa5264a16842860b