Malicious PDF — malware analysis report

Static analysis result for SHA-256 93bb3956ab988379…

MALICIOUS

PDF

86.0 KB Created: 2021-07-03 03:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4043229f43a7af0b749d8c45af8a17d0 SHA-1: f9f8a0a651bdef796c3b3003ef57edfca5ca998d SHA-256: 93bb3956ab98837932db072c269d263cf7cdb5029988d62041a5494c7f2fca63
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976b84b8bd6---loneradelika.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/0178isucbarg376qvmfgck6rn0/fabizev.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a50e60085f---gukolofenomozupid.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7e19d2572---senorado.pdf
    • http://huiking.cn/uploads/file/280115142941.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b757736ad3---rabosirokuwepelegubig.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2746bb018---xijelupiwobuji.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160769d4368f30---51729327982.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf00ba74edb---135420951.pdf
    • http://azseal.net/uploads/userfiles/file/woguwip.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/0ip68r2e3vjphm7iskqa43inin/45202888493.pdf
    • http://dancedynamicsla.com/clients/38740/File/telezapokosuwiso.pdf
    • http://asesorgubernamental.com/images/file/wibosobowekibu.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/0e60c9a43d91d7c82845601ca1c16dae/11712988545.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f02a8cc189---retapo.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/1df719c182d75c1a6e8535792b064a6c/datobabusakaduwisudorel.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607162b3400a9---gujixag.pdf
    • http://yossy.biz/userfiles/file/domixejapa.pdf
    • https://bakotech.at/uploads/ckeditor/files/77744306727.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090b9e412971---85556340226.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6a94e01a0---suxubigijuruvemudo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=extraction+of+caffeine+from+tea+leaves+lab+report
    • http://e1pl2.nazwa.pl/busy/fotki/file/17265719972.pdf
    • 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_off0000ed8e.bin
1cd286946612fb4e1e992f9611f8c3ae3579099dc07d5234ea3b1e4d5fd437bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xED8E 10932 bytes
font_01_sfnt_off000106bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106BB 16792 bytes
font_02_sfnt_off00011ecd.bin
60b96a7be9085720d5baa47f448dba5984e139e3e1c6bdb9fa63daa9a9e579c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECD 16684 bytes