Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a16bd73f1a46fae…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 19:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7523154c065671fb19d3f23363f4613f SHA-1: 31b0707858cbee1cdce3755ebec621603d0928d7 SHA-256: 1a16bd73f1a46fae368715ed009f26b24e4c1a66c13109f999b38dbf2f79e5c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm heuristics points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=tom+and+jerry+through+the+years PDF link annotation
    • http://dentalcenterstudio.it/userfiles/files/30960157479.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/42197551581.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161356e8d0b7e5---jotebatirasijovom.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/furoxuwug.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-08/images/files/8476040779.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/89681100554.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/19243302914.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/30242637949.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/mugegotojukurezarolonu.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/3682972816.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/difotaxetaxodajilubakemik.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/f376kqtrq9d1dbtu2vd75k2jh6/36662464012.pdfIn PDF document text
    • https://andana.us/files/files/kerimavamere.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fff21112f3---titobajeg.pdfIn PDF document text
    • https://linardi.ru/files/file/6679004295.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210916_150554.pdfIn PDF document text
    • https://akvaguru.hu/user/file/91977544443.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/55543480340.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/19690216073.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ndsk1n0fph2qpcotmf6qm5llo7/67414744262.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/65123924443.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/lekedevunu.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b04958c655---35510921844.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/moson.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/fekakir.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_off0000b367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7E 10864 bytes
SHA-256: 708583835ea74a8bd714d35562b7012d8fe871949df4860b7276e547f24385a5
font_02_sfnt_off0000e438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE438 14620 bytes
SHA-256: 69851cf5f1acb24393ee47b6c7e1e3f53c1e089f74f83d79b7d18f8172140f2c