Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b82f19e736ef59…

MALICIOUS

PDF

88.4 KB Created: 2021-06-26 05:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 636e16d7d241694b4ddebe43c13b881a SHA-1: a9499c6ca153449c882d8c221809f44a7cba4137 SHA-256: c4b82f19e736ef5950a56b4a0f658d8862da8061e7b06f9b66159a01d6266f1f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest this PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bceda22e0---61593125912.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/c3354294be7e1902f02e86070b5c91ae/gosajugibivonof.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160829fd93599e---zapetirikoj.pdf
    • http://studioagronomoserragiotto.eu/userfiles/files/24490184462.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d268685e9c---pugumonoturubekuv.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9758370042---5472224717.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/pumoxezetarorexufusef.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077b0540af45---40116726215.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/5e842b246955613a6a66118683215ec6/zulakix.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4c2f7732f---83800879361.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160984e854053c---soligusolo.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03b7fe437a---zezutopijigogezuzamalo.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/vodelufapix.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bd6407957---nonatedexixutatuvubej.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/2hsl1nmvkigdlc66kohd791ndu/59647609104.pdf
    • http://konditsionery-reutov.ru/upload_picture/file/kikexikoserakiwokumu.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160869e5c4de32---nupipi.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/afb1a5747fd761989841fe12d743b3b4/rafusexa.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/06a2e6ce4ff4be7117778e18916f0bc6/riwudog.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/bezazitamasarugom.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9229c2e716---bolokojame.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/5249279af0ac3c4fc70ffba4e4ed73af/52358836849.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ogkntat8n556cv5cjir44jiie3/98002563850.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cycle+of+socialization+essays
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f537.bin
224d02004bdf467c6ca13db503b4df637386a7f039961ad60fed3ec3d7ede4c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 10432 bytes
font_01_sfnt_off00010d1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1E 16792 bytes
font_02_sfnt_off00012530.bin
cca8edfcd98a7ce3e0cbbe9e99411e344fcf36ecd7ea455dec8eb92befdf407c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12530 17392 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.