Malicious PDF — malware analysis report

Static analysis result for SHA-256 92131542b29edfaf…

MALICIOUS

PDF

199.4 KB Created: 2021-07-18 14:38:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 303cbafff35e87b43891c05616dc312d SHA-1: 1a21665e208b5605b6fd20a917cdc20c4c5320af SHA-256: 92131542b29edfaf8b23660cedb05dee4fe532a8d2ae806fb60593718f8d7a74
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories, suggesting it's used to redirect users to malicious content or phishing sites. The presence of embedded URLs and the nature of the heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

Heuristics 5

  • 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.
  • 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://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d76cda16efbe04eaf7acb9595ce0d3c3/84031768164.pdf In PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/4563a709c15267a25799f07495fce7a4/53429418653.pdfIn PDF document text
    • https://123natura.com/stockages/files/27602741638.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/1878391a422e172991b21c829461046a/wepir.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/b6ce33c74f4bd152bdf3d19a20929481/69058571286.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210606_DDF3F8A8B56715CD.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202161913356.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/wejisubapumemid.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/63c646a8f77476b4c9c68a4ddbb91baa/tubovulerulifetuxojunuvad.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/lalogife.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cbce31c471a---fofixikibowu.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082de352b229---5227084943.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ut2sfci0erchdajo00lgf2i8eh/dugaretumuzatawas.pdfIn PDF document text
    • http://grimastone.ru/files/begid.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/a8j08ti4tdoaijf19b3j4bfbc4/nibadakilefomesumivakil.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfae43d6ec7---91236041619.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/452663b01bcda59900aa3bc51cc08fe2/nugadaregiselaxamun.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b087d9bcbe4---8416555519.pdfIn PDF document text
    • https://samowar.ch/upload/file/zazaxa.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/20973244447.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/atd561r193ov025pd4u871jf63/kirutidusedu.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/99d92f8fd38f38fb56105d1a1aad4934/bavomu.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/v3125htrp4v9tnb4bfmm67je0o/11250958505.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7b4358a65---59865268664.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2998e0d3ff---sidajibatoxedelepoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=about+medieval+periodPDF 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_off0002aeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AEFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002c711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C711 19268 bytes
SHA-256: bee75b6bedf4fdbba9c9383d098c187a3e428b7540716afbd4b0588b32f00808
font_02_sfnt_off0002f7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F7D3 10568 bytes
SHA-256: bd633a3d94a91ab23537df9d46993b923ca1c6285140be17a3bcf01e8d6eb076