Malicious PDF — malware analysis report

Static analysis result for SHA-256 49bade494ba667e6…

MALICIOUS

PDF

107.3 KB Created: 2021-07-22 23:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cef7247026edf82befa5cddec8ca2727 SHA-1: 82f533ed5a2448b4f268b21961467004f23b44a2 SHA-256: 49bade494ba667e6964ee8421b29d00bf4f6d68af48e8023c172fff35dbd3c5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of multiple external links and the heuristic findings point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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 https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/08657cfdf490f8ff32ff186e04dc8cd8/nosejexutelexuzuvojese.pdf In PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/62728f3eb62038ce70079fd1e3ed231e/fagax.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e79bf3040---21901655774.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/07054d2065aae3e492de7dc4ac70e44e/61130748242.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b8824165817---96832497556.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/luxudati.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095d2227893b---xafikizuzofegibujet.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1d942629d---xoxexozixexafabizusimevun.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/ae26edd2c9b7d995a209a3191b9e3e09/16330343742.pdfIn PDF document text
    • http://guchenes.com/d/files/jovatavapusa.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf213df9f0---gotopop.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3115d5f24---59926019968.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/i0o5c77odj4eguukc52a1g4pe6/8850443744.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/qr89hfd8utl59u0nq0bsr6tndi/nirunezositigonerogut.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/dojobaroxonerijem.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84e25d1c51---26126258372.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084b3a140236---87923856453.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160834e88afb7a---dabexenotupul.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607baf4339924---poxetexalubixesexobamu.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/luzoxakavobuwametibuvu.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/3b5a70fd8c635a5c458c1aa287891458/govudaluditerejetuwe.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/21751044462.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b00d009512---481726548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=arabic+terms+of+endearment+for+childPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_010_off00017356.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17356 22948 bytes
SHA-256: bafe0869be90117b5295bffd8d6094f12f025dd6bd138e1218b2f38de4758028
font_00_sfnt_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 21004 bytes
SHA-256: ee4186d15cfcf466113ed8659bce63b7eeb7df0465ea9a461b299128e976e785
font_01_sfnt_off00013810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13810 2288 bytes
SHA-256: febd22ff027061193016eadfde159f11f0e6f3e0dbab964b5bc24dd734b1b07e
font_02_sfnt_off00014259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14259 10864 bytes
SHA-256: 39e72bd5b21f2c04b11bc58f592f64f3e2dd7cfc52733da1131b74ff633bb29b
font_03_sfnt_off00015b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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