Malicious PDF — malware analysis report

Static analysis result for SHA-256 739ebc3339e3fec5…

MALICIOUS

PDF

83.7 KB Created: 2021-06-30 06:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ed35fa09318051067928bd20daf0db5e SHA-1: daa6352b5be600f3f98f890aa6fe9162ee65447f SHA-256: 739ebc3339e3fec5c87deda4e15bf130fcdbc36d33cc5f9f5b93fbb47ba6b791
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d394805268f---wukalizefopaduv.pdf In PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/1be5726f11b3439a96ee402f3023934b/samumipisosizo.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c4b12d0e5---77248549296.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d581aa9d4a9---22215897139.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/aa06b95ba4d7daca55c4a39d70cde769/fuboxoxujinigodot.pdfIn PDF document text
    • http://chikatere.com/Upload/files/zaxisugadez.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/88941638562.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a8b7aaba3---vipepekadidixobizaj.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab88b2372ea---vixorelojefabelamuso.pdfIn PDF document text
    • https://honda-otolongan.com/upload/files/87570011385.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/xazoko.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9516b88f4bd10df5a5d32cca83ca0ddd/10304110736.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c786959cbf---5511598736.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/texapezo.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/61778516690.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085276a9eb28---74549463329.pdfIn PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/kepizusel.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760a533d158---xokilu.pdfIn PDF document text
    • http://yejida.com/userfiles/file/xufabamopelokejesi.pdfIn PDF document text
    • https://citytrafik.nu/images/file/kutosubodovi.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/wimukutumapasot.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/nilifeb.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/f62146d3cb902ee2505c287a1ef3747a/47948887037.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/db3b4778dbd9f2b3f5059b5deab1aa32/28112773515.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/7a06886eec82e9378b8ec1f0339376b3/67729020524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=paul+tieger+do+what+you+are+pdfPDF 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_off0000e20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20B 17064 bytes
SHA-256: 257e5d7b0d36ada532cbb3009509a19534811e3f920d29a1f14767edf8d1f63c
font_01_sfnt_off00010ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECE 10808 bytes
SHA-256: e17ddee7c1e4f285d31bf8da321ad986b062b979da9d41659cd7479d7fee5ac7
font_02_sfnt_off000127b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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