Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd0ce2fc8211acd…

MALICIOUS

PDF

79.9 KB Created: 2021-09-15 14:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 012169b72b8e81f75d483b7385988e37 SHA-1: 672038e20d6ce586a3749162807b897e0e6e2257 SHA-256: 1fd0ce2fc8211acdd22ed20e86210c7448bcc86b0797077b11c032a89c643026
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple external URIs and link farm heuristics indicates an attempt to distribute malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://polskienarty.pl/data/aktualnosci_imgs/file/gufikopaxukebovugifog.pdf In PDF document text
    • http://pnlestari.com/visitbali/image/files/pukinarafij.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/nugufupoxinuvuxejivubireb.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/ruwunavifavevevozo.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/83884382156.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/dre6kvc1jt7gvvucukg8l08l15/71799473772.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/54631610933.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613c311342d55---76412276824.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/14195844218.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/desegopufutu.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/tofewa.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/56278931759.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/banibiwas.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16138c6d8eedc1---zowowiva.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/pipifosok.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/benunanurisawa.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/gedur.pdfIn PDF document text
    • http://manenshop.com/upload/files/99338689715.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/83901342651.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/22466315446.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/dimubipibadurumobosijo.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/fovatutubagovuvuxo.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/tixatebenipitekonexe.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/xitujoto.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/b1c74bc9a7787a1c670b42042fe5fa55/38708417771.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/17344610690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hotstar+mod+apk+free+live+cricketPDF 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_off0000ce47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE47 18740 bytes
SHA-256: 9a3b1247abd891e126759a847831323de5474d4a5bb1ae0dbf9cd5dd1991a62a
font_01_sfnt_off0000ff42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11759 10828 bytes
SHA-256: 6bd40018ae32437449dc90b606a89b508d87601546ba7bfe5df370311da5561c