Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6cb57874a208cf…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 19:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 11d9769801bf683b9dbf77c0120c3c1d SHA-1: 16704a6ada92d74d4da1fc022dd087181c688562 SHA-256: 7a6cb57874a208cfd310cef964420dd9296085ab8f9905ad19456d4ad954b94e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these redirects. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://wastran.ru/uplcv?utm_term=gastroparesis+dm+pdf PDF link annotation
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/regeziramefuniw.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/dujuxonipajeguw.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/24380758934.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e8d8ace01b76efa1cb1f596cfe89192b/sewitasup.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611b943267145---88617189659.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612e2a6c323f9---42934693422.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/redexivigaxija.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/fujorukatarufujo.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/sekaemcli1ducq37ulp5ragg4d/xatanunipameladetusag.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/joxazutuvoxutepo.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/valofuw.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0e04591bcff24c46fbe48c14cace54e9/90638589534.pdfIn PDF document text
    • http://centronegozi.com/public/42680755213.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fffa38331e6---96200513486.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/868100680085abdfab81a4365992d33e/jokedelanenebopobuxas.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/gagatutafogap.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160929a6d7820b---woraxutalujabusipojanizi.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/kerokapavotesubenapa.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/83251192413.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/13306835410.pdfIn PDF document text
    • http://enricobarraco.com/files/sagikeme.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/77377650427.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD751 16180 bytes
SHA-256: d618c03e913ba5b6e042ca4df9e37c7d3c4a471bb4c00724ee623d9c7f0b9447
font_02_sfnt_off0000ed06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED06 20976 bytes
SHA-256: 2be7bfcf495e4a3d83b269f5a2200ac772521ac695b94cfee88bdd99ddb650b8
font_03_sfnt_off000122ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CA 10548 bytes
SHA-256: 919ce4801299f4b72d08fedaa6a3341fe1af3d888e0a1bcc49466309f1d74b3d

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