Malicious PDF — malware analysis report

Static analysis result for SHA-256 2540d852eac2a5b8…

MALICIOUS

PDF

89.5 KB Created: 2021-07-06 01:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a23879e06f7dba9cdc6b1a73949c8ec8 SHA-1: 17b224b58a685c27e8a84e4fa6c1a93e71e5216f SHA-256: 2540d852eac2a5b81e178bd15665c0e29f348d8d7793cb5e340a66ae485d70c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and an ML classifier, containing embedded JavaScript. It also functions as a link farm, pointing to multiple URLs hosted on potentially compromised websites, likely intended to lure users into downloading further malicious content or engaging in phishing activities. The presence of JavaScript indicates an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3385630986---fudizirim.pdf In PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/27511519528.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/buwujexa.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160799b9dd0ab3---99040636345.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/zepotumaxexurevusiwavakuv.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/mubagenomopeluxero.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/biwudezijaso.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/2861882972.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/32f9d01276e327c0aeca163132246005/pogemimabedopadatup.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/7041943637.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/314a316067bcb87116f5a73ef7f75e4e/xugorawidopizugetago.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/78196705257.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25ca43c60f---tojadoxefujojat.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/cdc480184374859b66af9f54c173724b/firerilibejoxawaxe.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/suzivixavorufamase.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/e5337237a9871b07f8da3a59ecfd3c84/64841212226.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/rmdqofa551gk1khq9dna3ul0o4/fumununawasoveb.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/lubese.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/e3uo5m2f77ql8eu61gh837ttp0/78922692681.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609c51d6acae1---verozivazegelanu.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/mitetisovujofefikerefo.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085c1f79ed07---kofekewerometefobewuma.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/40f4729e626324bbe72bbe4a889fb735/lejagalizuta.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/e05893e09621e10cba1542bba42ffbe4/tabidirexuzoxivolaj.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/46295741661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=states+of+matter+other+than+solid+liquid+and+gasPDF link annotation
    • 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_off0000fa03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA03 17312 bytes
SHA-256: 5f3f514daf9475cccbb8eb78641a7b0e299adb39ffdc04c956cd86a7bb7af722
font_01_sfnt_off00012766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7D 11120 bytes
SHA-256: a3a33918894d09cd49a52fbe9ebdaa2e157767d17e1a3638032e216da8dbef25

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