Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c99d5e97204e722…

MALICIOUS

PDF

103.0 KB Created: 2021-09-18 23:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1fc76b274f23ed2f13df8dd1f5558c97 SHA-1: aaa278a2a7b7ec0b96a0894dee3877b49025453e SHA-256: 2c99d5e97204e722d23c0210f3ec4d6908f81a89d5bdf58b772673a19fadbb68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, indicating an attempt to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a phishing or malware payload. The embedded JavaScript is likely responsible for redirecting the user to one of the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16134868bd5751---36139432663.pdf In PDF document text
    • https://akvanova.ru/sites/default/files/nebigufoj.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/binavasuvazazezodawutidop.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/pinetefejamowina.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/33236056332.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/14947346354.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/zugofitasozojon.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/38797990991.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/26010435634.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/fexedebasedusivurareligav.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/tigumesutodowejusilatuwuv.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/51923196020.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/siwika.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/37070350458.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/vamituxutujobi.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/jpvbev4n4gpo9rqma570826917/12740147472.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/79310721628.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131596775d87---78782200575.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/junolaxovopigomuxikur.pdfIn PDF document text
    • http://i-physiology.ru/upload/jupejefoninifozare.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/tujiwa.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/tazalataxevidizexapuw.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/92147425021.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/13105432296.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161409d64eaa34---99535022137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=cinderella+full+movie+freePDF 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_off00012c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C75 19084 bytes
SHA-256: 4bbe0bfe696a151eeb596a2f120f8198426e1ce686c5532f06da6b9045bc229c
font_01_sfnt_off00015e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001767b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1767B 10444 bytes
SHA-256: 14469f9f14d16b30de4cbb1f572100bdae69fc7273807fcb167929498ac36f0c

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