Malicious PDF — malware analysis report

Static analysis result for SHA-256 54721fd85aed876c…

MALICIOUS

PDF

70.2 KB Created: 2021-09-19 11:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f7518baeb1bc13e0ad6acaf3d77f3659 SHA-1: 8e206a62022b954039da9c3da43e088b899386b1 SHA-256: 54721fd85aed876c362b8083a7d1b2e53898665988c0a00af0a318faf0f34a26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs, many of which are part of link farms hosted on disposable or compromised domains, suggesting an attempt to direct users to malicious websites. The presence of external URI heuristics and compromised CMS upload links further supports this phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://synerhu.ru/uplcv?utm_term=chatroulette+unban+android PDF link annotation
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/1756675d968c63ba9f64dd488dc5415c/83977174071.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/suzizodizokekoxureda.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161399bbd4afe9---wofud.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/godibatobasogiweser.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/vepiwufojibozowokibe.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/77874142797.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/zonagazubuzatev.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/98262792845.pdfIn PDF document text
    • https://12shio3.com/contents/files/danijujeduwilupogamowo.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/34194246732.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/punibimadumonakir.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/29505741801.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/90722847285.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/34208779657.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/48373943590.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/2226962065.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210902152818_fot5jd.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/tegega.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/93837323504.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/80075275330.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/gufekoziwozetaw.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/d7571dcfbd36c9a0f18eeba498f43d2e/15174596865.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/xonumijubaxulinekibe.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/jufararesu.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143777d5f639---1186898149.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/xukupesobiwebe.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_off0000b257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB257 16012 bytes
SHA-256: 13e4156ce02e0129840e0be817d65be234bbee0d6b426a0200f1ffbae55d0059
font_01_sfnt_off0000dbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB4 10448 bytes
SHA-256: fd7926e0dd4404ed50599ad72bae554357daa97e4b4d042802e23171607cce88
font_02_sfnt_off0000f350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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