Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb3ca58c9fb573d…

MALICIOUS

PDF

73.1 KB Created: 2021-09-15 15:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a9c491d634abecb23429edf04bf444cb SHA-1: 637711a366b39c4914ee2a834723d374fb13e140 SHA-256: ffb3ca58c9fb573d7d22f24ac9b0ca0398789d598615ff948f6cee8a9ba5794f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It impersonates a cloud document lure, aiming to trick users into accessing embedded links. The presence of embedded JavaScript and a link farm pointing to compromised CMS uploads suggests the document is designed to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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.moyekolodin.com/files/fogedamuzofowoderojag.pdf In PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/62437690853.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/38793122215.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/jobavibasupidotonidi.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/nanejaniliwakavape.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/ramiralikabowaxe.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/73780679534.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/c930793415f347ef48eec3ab49bf270a/33831938711.pdfIn PDF document text
    • http://doxity.ro/ckfinder/userfiles/files/53590511130.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/80967330251.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/kapugijokifaxifewul.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf5aa22f14---tumijape.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a09998f907---kaduvokuzavo.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/18535845483.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9ef716400---xewedinomuvegupegek.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/3dc8dea9257cf273421a3d61c57538f0/26941933687.pdfIn PDF document text
    • http://tencanpowder.com/d/files/naxazoxogukafifozaro.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/juxat.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/98036027915.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/papubotegolonuroz.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/98003003818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=id+for+industrial+generator+in+unturnedPDF 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_off0000ba05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA05 17152 bytes
SHA-256: 05096ab244995a68fbd1b4bf9edd4bd273ea8b8d970d4daa6dcbb6a92b05b9d3
font_01_sfnt_off0000e6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D3 10580 bytes
SHA-256: bb3688c74432f777f5f631207e34e5e580fc4ee64e91541d0c886d973c7356bb
font_02_sfnt_off0000fee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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