Malicious PDF — malware analysis report

Static analysis result for SHA-256 189c587bf1a92277…

MALICIOUS

PDF

74.3 KB Created: 2021-09-04 22:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 48ab9b96a97dd7e29b7f31c3968ff86f SHA-1: afe053231809862990d5a77f9c00edff1ed8de3c SHA-256: 189c587bf1a9227787dc8646130218cfd4a87e8f63ff0fc11f468db97b686ca3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, including one pointing to a raw IP address, suggesting it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://muzycznescyzoryki.pl/userfiles/file/wenak.pdf In PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a936f1218ed---54608238889.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/kivewulux.pdfIn PDF document text
    • https://wecareprogram.org/images/file/10623808495.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/gapirejojoverejudaxezo.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f9f1f2cd40d0994261a067436536a92b/76565950432.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/wiwulamoxodudovevavupo.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/pesejirax.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/82102492913.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/liwekode.pdfPDF link annotation
    • http://varosom.hu/userfiles/files/59825662541.pdfIn PDF document text
    • http://abnicum.com/files/file/58697141077.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/bazapo.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/8scrfrt9jjvr8h1pp0kbvdpahv/pidogubirukajebofaverire.pdfIn PDF document text
    • http://falerisztika.hu/tmp/kewadudugubul.pdfIn PDF document text
    • https://kaimano.it/file/39397206174.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/48855845580.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/3417bd284b0087c8fecc1d418f910999/wiwokevavaridezab.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/27369304052.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff967cc677---41797822633.pdfIn PDF document text
    • http://0851gay.org/userfiles/202107file/2021072411031170554.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/selomidivotadegavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=achievers+richmond+a1%2B+pdfPDF 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_off0000ba94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AB 10840 bytes
SHA-256: bbe4f4272aeeada4904620ac1fd0544a66fa6c78bc1eb16bfe00739b3f2a0fc2
font_02_sfnt_off0000eb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB95 18576 bytes
SHA-256: 1b0972f10c0bfc2ea0c45f2c15a451fe3cd1145eaca66f41e442aef635da5829

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