Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7827b610d776819…

MALICIOUS

PDF

82.4 KB Created: 2021-06-29 22:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dbda3644f9621614d9c3c17cd592fb19 SHA-1: ab21ed784b120a1d520d63b4700bfd533fdd1dfb SHA-256: e7827b610d776819868460069be19473bd443220977a07ecff993168710e7f29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host or redirect to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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 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 http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078a8e8b7241---85061319446.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/fe531fce342022bdd338b06e27aba6b1/28831108837.pdf
    • https://ebooksweb.net/files/file/zokudilagex.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/vhev0o1scdr9qj4qke2uljadlq/wujadapazuguv.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dbb04f2ad---wisarisanejup.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3734d98ae3---pisixibanurasovedate.pdf
    • http://qkmedica.com/uploads/userfiles/file/86592767326.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4f43e1054---31306166542.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b753c2bd004---fofofejabob.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e6d3ba3bc---21331668077.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/c39709b5f5f7e6c7fae4911542455851/18354839533.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f6a33eeb5---13392214973.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/6536745cb62f1fe353df5d3b24069cd0/10165033457.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/ba1a4b3d1424d150dd1dd7d175a97dce/wazilonudes.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210506181432.pdf
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/riwisawikoves.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abb8fec9390---90324299477.pdf
    • http://rld-carbon.ru/file/30075442114.pdf
    • http://rydelko.pl/userfiles/file/legixijebizodenujofo.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64cc645ab8---19752738087.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc5fda11da---6563600391.pdf
    • http://biosafety.biz/ckfinder/userfiles/files/65564012012.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b192c1b79---wonolodupujosunesexaxobow.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/95a840b7af49b867b9908049d16ad945/fanalezeniwinuludiselo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=chris+crawford+the+art+of+computer+game+design
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3F 16792 bytes
font_01_sfnt_off0000f551.bin
7c4b35c07c15dbeec593dadae9aef19e60c98c11bc235a0686155074d7a3277c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 16488 bytes
font_02_sfnt_off0001201b.bin
7065ad95ddfa23c60ac4a392076acef270392b15806b480a7b877933ae50acad
pdf-font-stream PDF embedded font (sfnt) at offset 0x1201B 11240 bytes