Malicious PDF — malware analysis report

Static analysis result for SHA-256 d550bd937f68626e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 17:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d16848192fff7ffb45b7d85acdb250e0 SHA-1: 9e848dca46cecbe19f1e352a2bc53d043bd1d947 SHA-256: d550bd937f68626edba8eba5ed067680c45efa79c72117b7b66dad5e484e4287
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://www.gdchgs.com/admin/img/files/pusiwi.pdf In PDF document text
    • http://sellmysayarah.com/userfiles/files/28128566701.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/85917739447.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/13020305112.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/mawupim.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/80149221994.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/vefupivavaviposabu.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303cbc120fe---192315846.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/36911814066.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b416ab4810---ruturawefemasowaw.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/13194328771.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/6f8609b74799c966bbb6771a15025e2b/zezapufariwotoratowuwon.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/94790373163.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/5164890437.pdfIn PDF document text
    • http://hkalc.com/userfiles/doxetapanajiweme.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/pefodose.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/65260914010.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/fizivuzelezaza.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/putitaxelasoxavagejolu.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161448010305e9---95387199686.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/fomedebaxogipemamavexuw.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/tikop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pineapple+poker+androidPDF 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_off0000df33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF33 10212 bytes
SHA-256: 16d7ea60090ebdfd1d41cb43ef6b23d0e6c28d796df43c7105620befbf19ce6a
font_01_sfnt_off0000f61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61A 17220 bytes
SHA-256: 451f5cdd0f73ad295d3cdf316c2e6b796b45528bbd13d7997b381c42f73bc502
font_02_sfnt_off000122f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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