Malicious PDF — malware analysis report

Static analysis result for SHA-256 5501b8cf9cb1b6cc…

MALICIOUS

PDF

72.6 KB Created: 2021-09-19 09:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5007e92b5bc120d7ab00d327e62cde3b SHA-1: 9361544d8eb4947577d71152b3e17035e477da9c SHA-256: 5501b8cf9cb1b6cc3ab42ee3ab932096041d1ef9b9ea2ddc7b152a85e0cdb88f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised websites and disposable domains, suggesting an attempt to redirect users to phishing or malware-hosting sites. The document's structure and embedded links strongly indicate a malicious intent to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=5+letter+word+starts+with+l+ends+with+y PDF link annotation
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/8982461c540d9678c4b75f7eef4aad2a/gejenumumuw.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/xaligubipixejexawefomasi.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/11226422462.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/981091cc67e2ee7c9ab0bb4b8de6d08d/41819130830.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210912114756_hs6s2y.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/42010641087.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/mobuzavuvibosu.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0c2drb76v1i28qfqghpk63pce6/vajoxowerikuwi.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/nq6o22h6jg0hjto831btsggup9/wovajenasodaxariradarop.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137d46bd894d---tibovaxajemilepefokobe.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/vejubepobuvudobipa.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/75499988088.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/26320221136.pdfIn PDF document text
    • http://quetthe.com/upload/files/2178276509.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/842a6a38920aed8bfb74c3b62dcc8903/53692779294.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/suniwinora.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/78124858351.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/vunuwexevoduxokixidi.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/vimegefora.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/rubukaduzode.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109151837063029.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4s9i784ljc1ks2btukqr6pela3/suvenuru.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414d9daf626---kagamusafizoxopapan.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_off0000b722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB722 17084 bytes
SHA-256: 4a526980c16b5109234bbf9acb732fe0a5a2504c9574773e2efa5bc010d925be
font_01_sfnt_off0000e331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB48 10584 bytes
SHA-256: 744d3fca50d897e2b11bd8b5374e69127ff4dbeb60d21aeea33be9dbdeb171f1

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