Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb86522f289a7497…

MALICIOUS

PDF

98.9 KB Created: 2021-06-26 02:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6830b18a6001e92bb79f4aeaba12ffa3 SHA-1: 61a738a87bd38060989dba3d56dbc4f3b50d15de SHA-256: cb86522f289a7497eeccb8c823fdf526bd830892eb42d6eac73622d46bd2a650
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dae7166c81---lewiwejitemivu.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/e4169dbb190e1dc9e03d54ee06c982f3/38824377701.pdf
    • http://arniestribu.com/campannas/file/tatugenibubivemu.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d3898088798---jegegiwufitoxim.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3ab4b065d---watuxikabedixasun.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/d3e845b068ad91d3b6fee1fc6987e1a0/57083317609.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098939b2e503---furavadoli.pdf
    • https://hometeamcorp.com/images/usr/77243546722.pdf
    • https://sfasg.jp/js/ckfinder/userfiles/files/rigeb.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdf8eb7c4a---95817372224.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b850803d01f---49812199294.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/uua2enamq2csfqj5970qisn3qg/2491320526.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/q67uo8qaeurpa4v0fh8gd8p1r3/nubiwudaxewip.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/bf0e45a49a635ba048a57751fbe1818a/59006172834.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0e88ac7f1---40812106611.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/3ac4d6a5eec0a27e7aeceb383dbc0d30/4945277866.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc97a29614---10207788863.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/0896d797c51b30463214fb5f53659321/xomatenanub.pdf
    • http://beloezoloto.ru/userfiles/file/sifobidepimomelapit.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607175882f49f---78396523466.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d18932594dc---37045646920.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/eol6hqp1v5om8cpt2dg8m0li00/mufuv.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=democracy+and+citizenship
    • 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_off0001209f.bin
a903a318ffeeff76a8ed71fc5681f142a27811c5773277acd6bee66837c3b913
pdf-font-stream PDF embedded font (sfnt) at offset 0x1209F 17080 bytes
font_01_sfnt_off00014d66.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D66 16792 bytes
font_02_sfnt_off0001657d.bin
f1b7f6d38df2671a9db7e2ea27b0cd1398a250674a89529db22158d5feb5b005
pdf-font-stream PDF embedded font (sfnt) at offset 0x1657D 10908 bytes