Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d185639807b4eb…

MALICIOUS

PDF

82.3 KB Created: 2021-07-09 01:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58b16ba24e62c7cb41640b2e5e892485 SHA-1: 5083298188e1d067d633b092b0ce42127a01a2f1 SHA-256: 91d185639807b4eb3c345bf039c8feb898f08d4e13d010ab99b3e8eb9b346f84
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://rocincorporated.com/domain.com/images/dynamic_pages/file/11737651878.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ad9eafb0c---27089667581.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbe856b838---fozomawob.pdf
    • http://boissee.fr/userfiles/file/lugetojuve.pdf
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075085d594f1---30834696143.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d445b88f---22859370504.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcdf7298960---mulalizamofezu.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/314a95d3ecc796b58d11f7cd1636dde3/13323045687.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/82c706a4fb8299034d57e8bd8ee9a32d/7670048036.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/625b40c26ad8a3e26891aee4870dd248/98710709912.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b2029e48d---saxaruxunetabowukuju.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/mugeluranituku.pdf
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/56473370396.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e9dc1b1fd---vatudugip.pdf
    • http://asude.istanbul/ck_images/files/36377102360.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7698e4ada9---73421140501.pdf
    • http://studiotipaldo.com/userfiles/files/38815093871.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/5g8gnb280h187e4ebnebr1mr33/30334517768.pdf
    • http://m-styleauto.com/js/upload/files/zubuf.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/b1450bd0968b46130adf9a2c63df4543/soxuromuda.pdf
    • http://bronia.org/userfiles/file/62473098918.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5e2a9b4c---demotuz.pdf
    • http://nature-revive.org/files/file/wogep.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9a9ebf7d7---94874890788.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/97857147370ec45eb7aecce25e1bfe78/lomebexusitoniveju.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=tokyo+ghoul+opening+1+free+mp3+download
    • 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_off0000db9b.bin
90465ea960d4d53d3034534dd49e8840af594e2b101328e283b1fb6229bce5c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9B 17600 bytes
font_01_sfnt_off00010a46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A46 16792 bytes
font_02_sfnt_off0001225d.bin
82382a5c91f8c9e1ff63331c5652686ffee3617fac02a76f1549b3259ad81054
pdf-font-stream PDF embedded font (sfnt) at offset 0x1225D 11260 bytes