Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9db1d4e81761ea8…

MALICIOUS

PDF

82.0 KB Created: 2021-08-31 19:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 7f046e75f8d335e0b569e138b5d7b292 SHA-1: 65d50b19ba7ce2de929070e47073ce7afab3ece1 SHA-256: b9db1d4e81761ea822b64940a9e3c90feb6e5886b8ae2267772155565e7be176
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload storage, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a phishing campaign aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://alpinist.store/sribati/editor/uploadfiles/94125950543.pdf In PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce79b1996b---40508059877.pdfIn PDF document text
    • http://com123.vn/uploads/file/nurek.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8eda10f3c3291b26964443fdfe6b27b7/84111725249.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/efa4b2d2677dec534a512c1dd84ed243/jatadivedurobuwoli.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f40ce4cca---muxamunapak.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/42773727352.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a450975f062---69367904148.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/64843019344.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/sunozazaxeja.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/00d634f8e8e7637775aaacb63dec34b6/tijovuwebewirifegisal.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/tazejerobopovup.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/tapegisi.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb27ed08af---27499972996.pdfIn PDF document text
    • http://tochuchoinghi.org/files/40770840959.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/tinedarajexekemazaw.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/bazinatabasatazajowo.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/86211492902.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb1364e166---fefubisutirejezusekibit.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/11359120942.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/soridowesoxup.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/19008928274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=tracy+x+factor+2010PDF 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_off0000d886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD886 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09D 10260 bytes
SHA-256: b88dcc724390271200e333252c5176d6f5d3deb33db84bdb05584e06cb0227e5
font_02_sfnt_off000107f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F4 19540 bytes
SHA-256: bb685ba0fc73996ff46659c38c5f67f1e57cfcebb05598e820e8a45affa36de1

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