Malicious PDF — malware analysis report

Static analysis result for SHA-256 575bfebeb0350736…

MALICIOUS

PDF

88.9 KB Created: 2021-08-06 17:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ef3651e921816141ceead11c53ad902c SHA-1: 9e68398b9c18a32b900625f68719b4c183aa808d SHA-256: 575bfebeb0350736c6bc16e06bf2972e6a606d3aca98e35df4b9341c78f0202b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised websites or disposable hosting, forming a link farm. This suggests the primary purpose is to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=album+video+songs+tamil+free+download+hd PDF link annotation
    • http://wo-kop.pl/userfiles/file/mevavuliseb.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/45937180283.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f8f365b9a---biwomaretigafet.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/f2uo3r5jatngtu97929nk27417/91939302665.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16095c175bbdd9---95204178583.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/doxuwupusuxa.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ta0v2dr1vghooq8rlfvi1ed8rq/16589689231.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/59977169171.pdfIn PDF document text
    • http://hhcreunion.com/clients/4/43/43f38dc94a4d709fe78decf5bd9d7370/File/pojimefidivenobazanoli.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a599a06a5---11991960661.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/lelaxarot.pdfIn PDF document text
    • http://orderkai.com/uploads/files/69943422613.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/nasewupizenozafebut.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/15e567ca054e6bc18e0c7b100442687b/32814339390.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/q8vu7cvckj9k9hd42ai2uac2sp/85051853204.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/zosokezotira.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/67578335542.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607253293b1ef---20972663074.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/wurujek.pdfIn PDF document text
    • https://olterus.org/contents//files/22051128533.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/legom.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/eae1cfbb946221c6f2dd3bf5b036980a/81721009076.pdfIn PDF document text
    • http://amdind.com/userfiles/file/50567928032.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083a34f992af---33822816934.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/29087919219.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_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 11172 bytes
SHA-256: 713008dc3c9f5b73e0301cee8219d0f50e2576f281e60abfdc226896ab44556a
font_01_sfnt_off00010ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE6 17776 bytes
SHA-256: 38f62032670000f96472fe55b9498513b4355c6e588eea4abe8adabaedfd031d
font_02_sfnt_off00013d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1