Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6ddbd800e89d3f…

MALICIOUS

PDF

77.5 KB Created: 2021-09-20 05:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 598b94e74fdfa88d8d1fe45d35b7b771 SHA-1: 58b5b85e09c6a745f741c84fce702d145a9e8067 SHA-256: de6ddbd800e89d3f553d2ba44b10d620975710bc18aad3ce9ffb730ad073d7fa
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and a link farm structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ccsup.co.th/uploads/ckfinder/files/6824257021.pdf In PDF document text
    • http://china-baby-clothes.com/d/files/novanirufufumozikeba.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/gajasafapijitateveboku.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/37777015233.pdfIn PDF document text
    • http://arsvet.ru/img/upload/vomuliridafatuv.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/muwalumakinulawiz.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/misap.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161322f62ce61f---towobuwulirawojabavox.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/riwulimela.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613817e2933be---21321452541.pdfIn PDF document text
    • http://birdwatching.sk/media/file/bimosuvabugopuvumaxa.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/64533202055.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/faxiwotuk.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401eb2009de---51540994503.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/wexavotewinoso.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613314557a6e4---guwogawidepa.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/wagolubiremidenidepuzo.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613521a7d9ed6---menomububafik.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/34013051375.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/47135893704.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/12512988152.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/nujamabezawobokew.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/45002557360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=xiaomi+redmi+note+9s+call+recordingPDF 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_off0000c95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95C 10888 bytes
SHA-256: 5ac409b662afaeebbc84c7f82942a69bd7dcdb96783819e7de3d19da460db237
font_01_sfnt_off0000e258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6A 17880 bytes
SHA-256: b32088ef9954200ea59ad78def60874eba4e7b1497c76402181d5bb37533d041

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