Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ee71950cfb2f1a…

MALICIOUS

PDF

91.5 KB Created: 2021-08-12 06:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b7c7e0ad34927e54b3d1823cadfc2c43 SHA-1: 725866756625e658f2dda0f60615c502c492b278 SHA-256: 42ee71950cfb2f1a2bb67c52228977feb507ede9ec391a7802047d4b4a6f3a91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting it's used to redirect users to potentially harmful content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/r76iou1mmq3hefimps0c3ul7a5/vaxogipesalixutiguk.pdf In PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/rogozapalani.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/nepedukepinosik.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cdd9a4c8a---pozogasos.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/pajavobuvot.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/36661526ef7c7666b42b21da48ba45d5/15247797104.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/ac9997ce537954b440d159e6ebdd374b/70879925338.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd474088e16---nasores.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/27114937323.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/37063448346a1218556816d2ae3915af/razegavejebadobe.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc252a8e063---zesapupa.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6e9a5c2ed---mevojasasow.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/87577144847.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/getupofo.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/62177125683.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/664i7pou3ck23fselhi2aj9c14/lazokatagukatuborob.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/gorutene.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f8a217afe---29352541761.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/9f3ce3d90d223cb9ff54a9e8de91ddc9/ruxef.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210724211836.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/luvugitejewozomitekurijo.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/64170866565.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/memesupixow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%BA%D0%B0%D1%80%D1%82%D1%83+%D1%81%D0%BE+%D0%B2%D1%81%D0%B5%D0%BC%D0%B8+%D0%B2%D0%B5%D1%89%D0%B0%D0%BC%D0%B8+%D1%82%D0%B5%D1%80%D1%80%D0%B0%D1%80%D0%B8%D1%8F+1.4.0.5.2PDF 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_off0000edcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E1 23428 bytes
SHA-256: 2d3707f080939180008c2701e94f96f3c43ea1e952d5f079ca0bdcc830493672
font_02_sfnt_off0001406b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1406B 11368 bytes
SHA-256: 4734859e4f925364e3e2996076bdd923d4ef51bddba7d3175077425d01ec16a1

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