Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eebe8e91e66e107…

MALICIOUS

PDF

78.3 KB Created: 2021-09-16 12:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0c06434551a1e5a36f3adf8ee6a28502 SHA-1: 7b8aec1b9b73811ea0020b7af494e1326a635a29 SHA-256: 4eebe8e91e66e1074973ba742824535168c80f55ed8bc7941d511a5229a82ae3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external links, many pointing to compromised or disposable hosting, strongly suggests a malicious intent. The ClamAV detection and ML classifier output further corroborate this, indicating the PDF is likely a phishing or malware distribution lure. The embedded JavaScript is likely used to facilitate the redirection or download of malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://crewmak.ru/uplcv?utm_term=zero+order+kinetics+elimination PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613229985ecb1---mefepusujibukadasujorilek.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/miwuzegunofoxop.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/xivupirigazuzebupa.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/56297269175.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/11554955267.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/48329631952.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614278619d2bb---lisiwevegokamaj.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/wovozibuzul.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/xugowufe.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/luvugajuwobiwabobojuvimi.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/dojumopujusogamodeti.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395a1eb0954---dujalulugabafus.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf6041aa36---marutalira.pdfIn PDF document text
    • http://acril.ru/ufiles/files/bawuwebojemuvopufuzixe.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/46826279370.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/gizinupuzebur.pdfIn PDF document text
    • http://hanifeugur.com/image/files/95952781532.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/92915400848.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/87526344086.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f4221a9a0---nasuzibesimededorutadi.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/93816977405.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/58492346597.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/tubebubojiwumotabirenutu.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/savadiwabipabozisobirus.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/pusazimajovawagi.pdfIn PDF document text
    • http://rjt1.org/upload/files/defopiredaxipita.pdfIn PDF document text
    • 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_off0000cd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5D 10588 bytes
SHA-256: 7ea9a03ff37faefd7db3a584205de73d63685f7ec87f3a6d643f24fcab98ac07
font_01_sfnt_off0000e58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9C 18508 bytes
SHA-256: 015599b32aec6d2469f6f8f978bc0ea8a64c6dea3a284a76e969811369342020

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