Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c01e11d867cff8d…

MALICIOUS

PDF

84.2 KB Created: 2021-09-02 15:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c7d8d42b91ae4e4b81b4bfb3e0b15e58 SHA-1: e6f8db3c8eb6eada55a41836969c84c7a2ec8250 SHA-256: 5c01e11d867cff8d642d3384105abd27e20e22f2a1a4c5f4aae04de7174bd54d
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phishing pages. The PDF structure itself is also noted for duplicate object bodies, which can sometimes be used for obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/jipavabudirilipupe.pdf In PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/93166981457.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///7355218785.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/44858063761.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf6b23a676---7704236446.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/51a8415dc8085de17ec849e974f4a761/81047760713.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ovb7u634duraflrc5olrl2fk40/17410328457.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/38026164771.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36289829635.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/20874004703.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/fbb97312ab98dd2ca25c78bbe8be5e9f/26997378476.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/47bf8af2c98c1c0d73619f636969d629/11633260444.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5fc443106---45194182335.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/3b000e6287799b70b37f13e84c9c7625/gutedeniropalom.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/97722497283.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/38900768981.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/32254036020.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607210daca706---50128308332.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/b227a34cd38d082ae38b8f2b8e97b78d/sozofanurapakison.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/44778974343.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/82820415350.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/kejivobebozeji.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/diwedelevalagofesib.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/82091357167.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/89270993128.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/konetutimuzunotedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=fanuc+control+operating+manualPDF 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_off0000e659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE659 10628 bytes
SHA-256: 38032d2a984a7930476fc7fe396e2d2dd1a8ff20d54b03951a0ca67351f51258
font_01_sfnt_off0000fe95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE95 17292 bytes
SHA-256: 21e7a67aaeb1a0cee8eed56df8c1ea190cba4617dc00c128ecce478d13704195
font_02_sfnt_off00012b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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